#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

using Int = long long;

template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }
#define COLOR(s) ("\x1b[" s "m")


struct Node {
  int sz;
  // (00)*, (01)*, (10)*, (11)*
  int same;
  int sum, head, tail, lz;
  Node() : sz(0), sum(0), head(0), tail(0), lz(0) {}
  void push(Node &l, Node &r) {
    if (lz) {
      l.flip();
      r.flip();
      lz = 0;
    }
  }
  void pull(const Node &l, const Node &r) {
    if (sz == 2) {
      same = l.head | r.tail << 1;
    } else {
      same = (l.same == r.same) ? l.same : -1;
    }
    sum = l.sum + r.sum;
    head = l.head;
    tail = r.tail;
  }
  void flip() {
    same ^= 3;
    sum = sz - sum;
    head ^= 1;
    tail ^= 1;
    lz ^= 1;
  }
};

int segN;
vector<Node> seg;
void push(int u) { seg[u].push(seg[u << 1], seg[u << 1 | 1]); }
void pull(int u) { seg[u].pull(seg[u << 1], seg[u << 1 | 1]); }
void flip(int u, int l, int r, int a, int b) {
  if (b <= l || r <= a) return;
  if (a <= l && r <= b) {
    seg[u].flip();
    return;
  }
  const int uL = u << 1, uR = u << 1 | 1;
  const int m = (l + r) / 2;
  push(u);
  flip(uL, l, m, a, b);
  flip(uR, m, r, a, b);
  pull(u);
}
void oper(int u, int l, int r, int a, int b, int o) {
  if (b <= l || r <= a) return;
  if (a <= l && r <= b) {
    if (seg[u].same == 0) return;
    if (seg[u].same == 3) return;
    if (seg[u].same == (o | (o ^ 1) << 1)) {
      flip(u, l, r, l, r);
      return;
    }
    if (seg[u].same == ((o ^ 1) | o << 1)) {
      flip(u, l, r, l + 1, r - 1);
      return;
    }
  }
  const int uL = u << 1, uR = u << 1 | 1;
  const int m = (l + r) / 2;
  const bool f = (a < m && m < b && seg[uL].tail == o && seg[uR].head == (o ^ 1));
  push(u);
  oper(uL, l, m, a, b, o);
  oper(uR, m, r, a, b, o);
  if (f) {
    flip(uL, l, m, m - 1, m);
    flip(uR, m, r, m, m + 1);
  }
  pull(u);
}
int get(int u, int l, int r, int a, int b) {
  if (b <= l || r <= a) return 0;
  if (a <= l && r <= b) return seg[u].sum;
  const int uL = u << 1, uR = u << 1 | 1;
  const int m = (l + r) / 2;
  push(u);
  const int resL = get(uL, l, m, a, b);
  const int resR = get(uR, m, r, a, b);
  pull(u);
  return resL + resR;
}


int N, Q;
char S[2'000'010];

int main() {
  for (; ~scanf("%d%d", &N, &Q); ) {
    scanf("%s", S);
    
    for (segN = 1; segN < N; segN <<= 1) {}
    seg.assign(segN << 1, Node());
    for (int u = segN; u < segN << 1; ++u) {
      seg[u].sz = 1;
      if (u - segN < N && S[u - segN] == '1') {
        seg[u].sum = seg[u].head = seg[u].tail = 1;
      }
    }
    for (int u = segN; --u; ) {
      seg[u].sz = seg[u << 1].sz << 1;
      pull(u);
    }
    
    for (; Q--; ) {
      int O, L, R;
      scanf("%d%d%d", &O, &L, &R);
      --O;
      --L;
      if (O == 0 || O == 1) {
        oper(1, 0, segN, L, R, O);
// for(int i=0;i<N;++i)cerr<<get(1,0,segN,i,i+1);cerr<<endl;
      } else if (O == 2) {
        const int ans = get(1, 0, segN, L, R);
        printf("%d\n", ans);
      } else {
        assert(false);
      }
    }
  }
  return 0;
}