#include <bits/stdc++.h>
using namespace std;
typedef tuple<string, int, int> Que;
const int N = 3e5 + 5,
INF = 1e9;
int n, q;
string s;
Que query[N];
struct BIT2D{
vector<int> node[N], bit[N];
void fake_upd(int x, int y){
for(int i = x; i <= n; i += i & -i)
for(int j = y; j <= n; j += j & -j)
node[i].push_back(j);
}
void fake_update(int x, int y, int u, int v){
fake_upd(x, y);
fake_upd(x, v + 1);
fake_upd(u + 1, y);
fake_upd(u + 1, v + 1);
}
void fake_get(int x, int y){
for(int i = x; i > 0; i -= i & -i)
for(int j = y; j > 0; j -= j & -j)
node[i].push_back(j);
}
void build(){
for(int i = 1; i <= n; i++){
sort(node[i].begin(), node[i].end());
node[i].resize(unique(node[i].begin(), node[i].end()) - node[i].begin());
bit[i].resize(node[i].size() + 1, 0);
}
}
void upd(int x, int y, int val){
for(int i = x; i <= n; i += i & -i)
for(int j = lower_bound(node[i].begin(), node[i].end(), y) - node[i].begin() + 1; j <= node[i].size(); j += j & -j)
bit[i][j - 1] += val;
}
void update(int x, int y, int u, int v, int val){
upd(x, y, val);
upd(x, v + 1, -val);
upd(u + 1, y, -val);
upd(u + 1, v + 1, val);
}
int get(int x, int y){
int res = 0;
for(int i = x; i > 0; i -= i & -i)
for(int j = lower_bound(node[i].begin(), node[i].end(), y) - node[i].begin() + 1; j > 0; j -= j & -j)
res += bit[i][j - 1];
return res;
}
} bit;
struct SegTree{
int st[N << 2], lz[N << 2];
void build(int tl, int tr, int i){
lz[i] = -1;
if(tl == tr){
st[i] = (s[tl] == '1' ? 0 : INF);
return;
}
int tm = tl + tr >> 1;
build(tl, tm, i<<1);
build(tm + 1, tr, i<<1|1);
st[i] = max(st[i<<1], st[i<<1|1]);
}
void push(int i){
if(lz[i] == -1) return;
st[i<<1] = st[i<<1|1] = lz[i<<1] = lz[i<<1|1] = lz[i];
lz[i] = -1;
}
void update(int l, int r, int val, int tl, int tr, int i){
if(r < tl || tr < l || l > r) return;
if(l <= tl && tr <= r){
st[i] = val;
lz[i] = val;
return;
}
push(i);
int tm = tl + tr >> 1;
update(l, r, val, tl, tm, i<<1);
update(l, r, val, tm + 1, tr, i<<1|1);
st[i] = max(st[i<<1], st[i<<1|1]);
}
int get(int l, int r, int tl, int tr, int i){
if(r < tl || tr < l || l > r) return 0;
if(l <= tl && tr <= r) return st[i];
push(i);
int tm = tl + tr >> 1;
return max(get(l, r, tl, tm, i<<1), get(l, r, tm + 1, tr, i<<1|1));
}
} it;
void init(){
set<int> pos0;
for(int i = 1; i <= n; i++) if(s[i] == '0') pos0.insert(i);
pos0.insert(0); pos0.insert(n + 1);
string tmp = s;
for(int t = 1; t <= q; t++){
auto [ty, x, y] = query[t];
if(ty == "toggle"){
if(s[x] == '0'){
auto i = pos0.find(x);
int l = *prev(i) + 1, r = *next(i) - 1;
s[x] = '1';
if(l <= *i - 1) bit.fake_update(l, l, *i - 1, *i - 1);
if(*i + 1 <= r) bit.fake_update(*i + 1, *i + 1, r, r);
pos0.erase(x);
}else{
s[x] = '0';
pos0.insert(x);
auto i = pos0.find(x);
int l = *prev(i) + 1, r = *next(i) - 1;
bit.fake_update(l, l, r, r);
}
}else{
bit.fake_get(x, y);
}
}
bit.build();
s = tmp;
}
void solve(){
set<int> pos0;
for(int i = 1; i <= n; i++) if(s[i] == '0') pos0.insert(i);
pos0.insert(0); pos0.insert(n + 1);
it.build(1, n, 1);
for(int t = 1; t <= q; t++){
auto [ty, x, y] = query[t];
if(ty == "toggle"){
if(s[x] == '0'){
auto i = pos0.find(x);
int l = *prev(i) + 1, r = *next(i) - 1;
s[x] = '1';
if(l <= *i - 1) bit.update(l, l, *i - 1, *i - 1, t - it.get(l, *i - 1, 1, n, 1));
if(*i + 1 <= r) bit.update(*i + 1, *i + 1, r, r, t - it.get(*i + 1, r, 1, n, 1));
it.update(l, r, t, 1, n, 1);
pos0.erase(x);
}else{
s[x] = '0';
pos0.insert(x);
auto i = pos0.find(x);
int l = *prev(i) + 1, r = *next(i) - 1;
bit.update(l, l, r, r, t - it.get(l, r, 1, n, 1));
it.update(l, r, t, 1, n, 1);
it.update(*i, *i, INF, 1, n, 1);
}
}else{
auto tmp = t - it.get(x, y, 1, n, 1);
cout << bit.get(x, y) + (tmp >= 0 ? tmp : 0) << "\n";
}
}
}
int32_t main(){
cin.tie(0)->sync_with_stdio(0);
// #define task "test"
// if(fopen(task ".inp", "r")){
// freopen(task ".inp", "r", stdin);
// freopen(task ".out", "w", stdout);
// }
cin >> n >> q >> s;
s = " " + s;
for(int i = 1; i <= q; i++){
string ty; cin >> ty;
if(ty == "toggle"){
int x; cin >> x;
query[i] = Que(ty, x, -1);
}else{
int x, y; cin >> x >> y;
query[i] = Que(ty, x, y - 1);
}
}
init();
solve();
// cerr << "TIME:" << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
return 0;
}
