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#include <bits/stdc++.h>

#define ll long long
#define ve vector
#define fi first
#define se second
#define ld double
#define all(x) x.begin(), x.end()

using namespace std;

const int mod = 998244353;
const int MAXN = 5e4+10;



int calc(const string& st){
    unordered_map<string, int> cnt;
    for(int i = 1; i < (1 << st.size()); i++){
        string cur;
        for(int j = 0; j < st.size(); j++)
            if((i >> j)&1)
                cur += st[j];
        cnt[cur]++;
    }
    int res = 0;
    for(auto [st, c] : cnt)
        res += c >= 2;
    return res;
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, q;
    cin >> n >> q;
    string st;
    cin >> st;
    cout << calc(st) << "\n";
    while(q--){
        int a;
        char c;
        cin >> a >> c;
        st[a - 1] = c;
        cout << calc(st) << "\n";
    }
}