This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define ii pair<int,int>
#define F first
#define S second
#define endl '\n'
const int N = 105;
char a[N][N];
signed main(){
int n, m;
cin >> n >> m;
string fear, fav;
cin >> fear >> fav;
int pos = -1;
for(int i=0; i<n; ++i){
if(fear[i] == fav[0]){
pos = i;
break;
}
}
if(pos == -1){
cout << -1;
return 0;
}
int ans = 0;
for(int i=1; i<m; ++i){
char want = fav[i];
if(pos > 0 && fear[pos-1] == want){
pos--;
i++;
continue;
}
if(pos+1 < n && fear[pos+1] == want){
pos++;
i++;
continue;
}
cout << -1;
return 0;
}
cout << ans;
}
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