include <bits/stdc++.h>

using namespace std;

char find(char s,char c){

if(c>='A'&&c<='Z'){
	c+=32;
}
while(*s!='\0'){
	if(*s>='A'&&*s<='Z'){
		if(*s-'A'==c-'a') return s;
	}else if(*s==c){
		return s;
	}
	s++;
}
return NULL;

} int main() {

char A[10000],c;
cin.getline(A,10000);
cin>>c;
char *ans;
ans=find(A,c);
if(ans!=NULL){
	cout<<ans-A+1;
}else{
	cout<<"No";
}
return 0;

}