#include<stdio.h>
#include<string.h>
struct worddsata{
    char word[101];
    char letter;
};
int countoccurance(struct worddata w)
{
    int count;
    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=countoccurance(data);
    if(result ==0)
    {
        priuntf("-1");
    }
    else
    {
        printf("%d",result);
    }
    return 0;
}