// Starcraft 2 enjoyer //
#include <bits/stdc++.h>
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
using namespace std;
#define LSOne(X) ((X) & -(X))
#define int long long
const int N = 3e5 + 5;
const int LG = 18;
const int C = 26;
const int K = 7;
const long long INF = 1e18;
const int B = 700;
const int MOD = 998244353;
struct Fenwick
{
vector<int> ft;
int n;
void build(int len)
{
n = len;
ft.assign(n + 1, 0);
}
void update(int pos, int val)
{
while (pos <= n)
{
ft[pos] += val;
pos += LSOne(pos);
}
}
int get(int pos)
{
int sum = 0;
while (pos > 0)
{
sum += ft[pos];
pos -= LSOne(pos);
}
return sum;
}
} ft;
struct Query
{
int type;
int x, y;
int val;
};
int n, q, ans[N];
string s;
vector<Query> events;
set<array<int, 2>> seg;
bool cmp(Query &a, Query &b)
{
return a.x < b.x;
}
void add(int x1, int y1, int x2, int y2, int v)
{
// cout << x1 << " " << x2 << " " << v << "id\n";
events.push_back({0, x1, y1, v});
events.push_back({0, x2 + 1, y1, -v});
events.push_back({0, x1, y2 + 1, -v});
events.push_back({0, x2 + 1, y2 + 1, v});
}
void dnc(int l, int r)
{
if (l >= r)
return;
int m = (l + r) / 2;
dnc(l, m);
dnc(m + 1, r);
vector<Query> left, right;
for (int x = l; x <= m; x++)
{
if (events[x].type == 0)
{
left.push_back(events[x]);
}
}
for (int x = m + 1; x <= r; x++)
{
if (events[x].type == 1)
{
right.push_back(events[x]);
}
}
sort(left.begin(), left.end(), cmp);
sort(right.begin(), right.end(), cmp);
int ptr = 0;
for (int x = 0; x < right.size(); x++)
{
while (ptr < left.size() && left[ptr].x <= right[x].x)
{
// cout << left[ptr].val << "\n";
ft.update(left[ptr].y, left[ptr].val);
ptr++;
}
// cout << right[x].x << " " << right[x].y << " " << ft.get(right[x].y) << " " << "val\n";
ans[right[x].val] += ft.get(right[x].y);
}
for (int x = 0; x < ptr; x++)
{
ft.update(left[x].y, -left[x].val);
}
}
inline void solve()
{
cin >> n >> q >> s;
ft.build(n + 1);
s = " " + s;
for (int x = 1; x <= n; x++)
{
if (s[x] == '1')
{
int j = x;
while (j <= n && s[j] == '1')
j++;
seg.insert({x, j - 1});
x = j;
}
}
for (int x = 1; x <= q; x++)
{
string t;
ans[x] = -1;
cin >> t;
if (t == "toggle")
{
int i;
cin >> i;
if (s[i] == '0') // on
{
s[i] = '1';
int al = i, ar = i;
auto it = seg.upper_bound({i, n + 1});
if (it != seg.end())
{
auto [l, r] = *it;
if (l == i + 1)
{
ar = r;
seg.erase(it);
}
}
// cout << al << " " << ar << "w\n";
it = seg.upper_bound({i, n + 1});
if (it != seg.begin())
{
it--;
auto [l, r] = *it;
if (r == i - 1)
{
al = l;
seg.erase(it);
}
}
add(al, i, i, ar, -x);
// cout << al << " " << ar << "\n";
seg.insert({al, ar});
}
else // off
{
s[i] = '0';
auto it = seg.upper_bound({i, n + 1});
it--;
auto [l, r] = *it;
seg.erase(it);
// cout << l << " " << r << "\n";
if (l < i)
{
seg.insert({l, i - 1});
}
if (r > i)
{
seg.insert({i + 1, r});
}
add(l, i, i, r, x);
}
}
else
{
ans[x] = 0;
int l, r;
cin >> l >> r;
r--;
events.push_back({1, l, r, x});
auto it = seg.upper_bound({l, n + 1});
if (it != seg.begin())
{
it--;
auto [cl, cr] = *it;
if (cl <= l && r <= cr)
{
ans[x] += x;
}
}
}
// cout << x << " " << seg.size() << "v\n";
// for (auto &[l, r] : seg)
// {
// cout << l << " " << r << "\n";
// }
// cout << "\n";
}
dnc(0, events.size() - 1);
for (int x = 1; x <= q; x++)
{
if (ans[x] < 0)
continue;
cout << ans[x] << "\n";
}
}
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t = 1;
// cin >> t;
for (int x = 1; x <= t; x++)
{
solve();
}
return 0;
}
