#include<stdio.h>
#include<string.h>
struct Wordata
{
    char word[101];
    char letter;
};
int count0ccurrence(struct Wordata 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;
    scanf("%s",data.Word);
    scanf(" %c",&data.letter);
    int result = count0ccurrence(data);
    if(result == 0)
    {
        printf("-1");
    }
    else
    {
        printf("%d",result);
    }
    return 0;
}