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#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = a; i < b;++i)
#define pb push_back
using namespace std;
int solve(vector<char> V){
    map<vector<char>,int> mapa; 
    int wyn = 0;
    FOR(i,1,1 << (V.size())){
        vector<char> Q;
        FOR(j,0,V.size()){
            if((i & (1 << j))){
                Q.pb(V[j]);
            }
        }
        if(mapa[Q] == 1){
            ++wyn;
        }
        mapa[Q]++;
    }
    return wyn;
}
int main(){
    int n,q;
    cin>>n >>q;
    string W;
    cin>>W;
    vector<char> V;
    for(auto y : W){
        V.pb(y);
    }
    cout<<solve(V) <<"\n";
    FOR(i,0,q){
        int x;
        char c;
        cin>>x;
        cin>>c;
        V[x - 1] = c;
        cout<<solve(V) <<"\n";
    }
}