#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);

    char gabarito[85], respostas[85];
    scanf("%s", gabarito);
    scanf("%s", respostas);

    int acertos = 0;
    for(int i=0; i<n; i++){
        if (gabarito[i]==respostas[i]){
            acertos++;
        }
    }
    printf("%d\n", acertos);

    return 0;
}

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