#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define _size(x) (int)x.size()
#define BIT(i, x) ((x >> i) & 1)
#define MASK(n) ((1 << n) - 1)
#define REP(i, n) for (int i = 0, _n = (n); i < _n; i++)
#define FOR(i, a, b) for (int i = a, _b = (b); i <= _b; i++)
#define FORD(i, a, b) for (int i = a, _b = (b); i >= _b; i--)
#define FORB1(i, mask) for (int i = mask; i > 0; i ^= i & - i)
#define FORB0(i, n, mask) for (int i = ((1 << n) - 1) ^ mask; i > 0; i ^= i & - i)
#define FORALL(i, a) for (auto i: a)
#define fastio ios_base::sync_with_stdio(0); cin.tie(0);
struct queryNode {
string type;
int id, a, b;
};
int n, q;
string s;
vector<int> a;
vector<queryNode> qu;
namespace subtask1 {
void main() {
vector<vector<int>> c(q + 1, vector<int>(n + 1));
FOR(i, 1, n) c[0][i] = a[i] + c[0][i - 1];
REP(i, q) {
FOR(j, 1, n) c[i + 1][j] = c[i][j] - c[i][j - 1];
if (i && qu[i - 1].type == "toggle") c[i + 1][qu[i - 1].id] = 1 - c[i + 1][qu[i - 1].id];
FOR(j, 1, n) c[i + 1][j] += c[i + 1][j - 1];
if (qu[i].type == "query") {
int a = qu[i].a, b = qu[i].b - 1;
int ans = 0;
FOR(j, 1, i + 1) ans += (c[j][b] - c[j][a - 1] == b - a + 1);
cout << ans << '\n';
}
}
}
}
bool checkSub2() {
REP(i, q) {
if (qu[i].type == "toggle") continue;
if (qu[i].b - qu[i].a != 1) return false;
}
return true;
}
namespace subtask2 {
void main() {
vector<int> ans(n + 1), in(n + 1, - 1);
FOR(i, 1, n) if (a[i] == 1) in[i] = 1;
REP(i, q) {
if (i && qu[i - 1].type == "toggle") {
int id = qu[i - 1].id;
if (!a[id]) {
a[id] = 1 - a[id];
in[id] = i + 1;
}
else {
a[id] = 0;
ans[id] += (i + 1) - in[id];
in[id] = - 1;
}
}
if (qu[i].type == "query") cout << ans[qu[i].a] + (in[qu[i].a] != - 1 ? i + 1 - in[qu[i].a] + 1 : 0) << '\n';
}
}
}
bool checkSub3() {
vector<int> b(n + 1);
FOR(i, 1, n) b[i] = a[i];
REP(i, q) {
if (qu[i].type == "toggle") {
int id = qu[i].id;
if (b[id]) return false;
b[id] = 1 - b[id];
}
}
return true;
}
namespace subtask3 {
struct segTree {
vector<int> ST;
void init(int n) {
ST.resize(4 * n + 4);
}
void update(int id, int l, int r, int pos, int val) {
if (pos < l || r < pos) return ;
if (l == r) {
ST[id] = max(ST[id], val);
return ;
}
int mid = (l + r) / 2;
update(id * 2, l, mid, pos, val);
update(id * 2 + 1, mid + 1, r, pos, val);
ST[id] = max(ST[id * 2], ST[id * 2 + 1]);
}
int get(int id, int l, int r, int u, int v) {
if (r < u || v < l) return 0;
if (u <= l && r <= v) return ST[id];
int mid = (l + r) / 2;
return max(get(id * 2, l, mid, u, v), get(id * 2 + 1, mid + 1, r, u, v));
}
} st;
void main() {
st.init(n);
FOR(i, 1, n) {
if (a[i]) st.update(1, 1, n, i, 1);
else st.update(1, 1, n, i, 0);
}
REP(i, q) {
if (i && qu[i - 1].type == "toggle") {
int id = qu[i - 1].id;
st.update(1, 1, n, id, i + 1);
}
if (qu[i].type == "query") {
int a = qu[i].a, b = qu[i].b - 1;
int value = st.get(1, 1, n, a, b);
if (!value) cout << 0 << '\n';
else cout << i + 1 - value + 1 << '\n';
}
}
}
}
bool checkSub4() {
int cnt = 0;
REP(i, q) {
if (qu[i].type == "toggle" && cnt) return false;
cnt += (qu[i].type == "query");
}
return true;
}
namespace subtask4 {
void main() {
}
}
int main() {
fastio;
cin >> n >> q;
cin >> s;
a.resize(n + 1);
FOR(i, 1, n) a[i] = s[i - 1] - '0';
qu.resize(q);
REP(i, q) {
cin >> qu[i].type;
if (qu[i].type == "toggle") cin >> qu[i].id;
else cin >> qu[i].a >> qu[i].b;
}
if (n <= 100 && q <= 100) subtask1::main();
else if (checkSub2()) subtask2::main();
else if (checkSub3()) subtask3::main();
else if (checkSub4()) subtask4::main();
return 0;
}
