#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>

int main() {
    int N;
    
    if(scanf("%d", &N)!= 1) {
        printf("Invalid input\n");
        return 0;
    }
    
    char initials;
    int evenSum = 0;
    int oddSum = 0;
    int valid = 1;
    
    for(int i = 0; i < N; i++) {
        scanf("%c", &initials[i]);
        
    if(!isalpha(*(initials + i))) {
        valid = 0;
        break;
    }
    }
    
}