// editor1
#include<stdio.h>
#include<string.h>
struct WordData
{
    char word[10];
    char letter;
};
int countOccurrence(struct WordData w)
{
    int count = 0;
    for(int i=0;i<strlen(w.word); i++)
    {
        if(w.word[i] == w.letter)
        {
            count++;
        }
    }
    return count;
}
int main()
{
    struct wordData w;
    scanf("%s", &w.word);
    scanf(" %c", &w.letter);
    int result = countOccurrence(data);
    if(result == 0)
    {
        printf("-1");
    }
    else
    {
        printf("%d",result);
    }
    return 0;
}