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