#include<stdio.h>

int main()
{
    char name[50000];
    int sum=0,iter;

    scanf("%[^\n]s",name);

    for(iter=0;name[iter]!='\0';iter++)
    {
        if(name[iter] > 64 && name[iter] < 91)
            sum = sum + (name[iter] - 64);
        else if(name[iter] > 96 && name[iter] < 123)
            sum = sum + (name[iter] - 96);
    }

    while(sum>=10)
    {
        sum=(sum%10)+(sum/10);
    }
    printf("%d",sum);
    return 0;
}