#include<stdio.h>
#include<string.h>
struct wordData{
    char str[10];
    char ch;
};
int countOccurence(struct wordData w)
{
    int count = 0;
    for(int i = 0; i < strlen(w.str);i++)
    {
        if(w.str[i] == w.ch)
        {
            cout++;
        }
    }
    if(count == 0)
    {
        return -1;
    }
    return count;
}
int main()
{
    struct worsData w;
    scanf("%s", w.str);
    scanf(" %c", &w.ch);
    int result = countOccurence(w);
    printf("%d", result);
    return 0;
}
}