#include <stdio.h>
#include <string.h>
struct Data{
    char word[10];
    char ch;
};
int main(){
    struct Data d;
    int count = 0;
    
    scanf("%s\n %c",d.word,&d.ch);
    for(int i=0;d.word[i]!='\0';i++)
    {
        if(d.word[i]==d.ch)
        count++;
    }
    if(count==0){
    printf("-1\n");
}
else
{
    printf("d\n",count);
}
    return 0;
    }