#include<iostream>

#include<stdio.h>

#include<stdlib.h>

#include<cstring>

using namespace std;

string s1,s2;

int len1,len2;

int f[];

int main(){

    cin>>s1>>s2;

    len1=s1.size(),len2=s2.size();

    f[]=f[]=;

    for(int i=;i<len2;i++){

        int j=f[i];

        while(j&&s2[i]!=s2[j]) j=f[j];

        if(s2[i]==s2[j]) f[i+]=j+;

        else f[i+]=;

    }

    int j=;

    for(int i=;i<=len1;i++){

        while(j&&s1[i]!=s2[j]) j=f[j];

        if(s1[i]==s2[j]) j++;

        if(j==len2) {printf("%d",i-j+);break;}

    }

    return ;

}