#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define BL 512
#define SB (BL - 1)

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, q;
    cin >> n >> q;
    string s;
    cin >> s;
    constexpr int r = 26 * 26 * 26;
    const int bsz = (n + BL - 1) / BL;
    vector<array<int, r>> seg(bsz);
    vector<array<short,r>> cnt(bsz);
    vector<short> vec(n);
    auto add = [&](int p, int d){
        int hs = vec[p];
        if(d == 1){
            seg[p / BL][hs] += p - (p / BL * BL) + 1;
            cnt[p / BL][hs]++;
        }else{
            seg[p / BL][hs] -= p - (p / BL * BL) + 1;
            cnt[p / BL][hs]--;
        }
    };
    short hs = (s[0] - 'a') * 26 + (s[1] - 'a');
    for(int i = 0; i + 3 <= n; i++){
        hs *= (short)(26);
        hs += (short)(s[i + 2] - 'a');
        vec[i] = hs;
        add(i, 1);
        hs -= (short)(676 * (s[i] - 'a'));
    }
    while(q--){
        int cmd;
        cin >> cmd;
        if(cmd == 1){
            int p;
            char x;
            cin >> p >> x;
            p--;
            short d = x - s[p];
            s[p] = x;
            if(p + 3 <= n){
                add(p, -1);
                vec[p] += d * (short)(676);
                add(p, 1);
            }
            if(1 <= p && p + 2 <= n){
                add(p - 1, -1);
                vec[p - 1] += d * (short)(26);
                add(p - 1, 1);
            }
            if(2 <= p){
                add(p - 2, -1);
                vec[p - 2] += d;
                add(p - 2, 1);
            }
        }else{
            int l, r;
            char c0, c1, c2;
            ll ans = 0;
            cin >> l >> r >> c0 >> c1 >> c2;
            short hs = (((c0 - 'a') * 26) + (c1 - 'a')) * 26 + c2 - 'a';
            l--, r -= 2;
            int cur = l;
            while(cur < r && (cur & SB)){
                if(hs == vec[cur]) ans += cur - l + 1;
                cur++;
            }
            while(cur + BL <= r){
                ans += seg[cur / BL][hs] + cnt[cur / BL][hs] * (ll)(cur - l);
                cur += BL;
            }
            while(cur < r){
                if(hs == vec[cur]) ans += cur - l + 1;
                cur++;
            }
            cout << ans << '\n';
        }
    }
}