#include <stdio.h>

int main()
{
    int c = 0;
    char* s;
    char temp[200] = {};
    scanf("%s", temp);
    s = temp;

    while (*s){
        if (*s == '#') break;
        if (*s == 'A' || *s == 'a')
            ++c;
        ++s;
    }
    printf("%d\n", c);
    return 0;
}