#include <stdio.h>
#include <math.h>
int const M=1234567891;
int main() {
    int n;
    long long r=1;
    scanf("%d",&n);
    long long sum=0;
    char str[n+1];
    scanf("%s",str);
    for (int i=0; i<n; i++) {
        sum=sum+(str[i]-'a'+1)*r%M;
        r=(r*31)%M;
    }
    sum=sum%M;
    printf("%lld",sum);
    return 0;
}

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