#include<bits/stdc++.h>
using namespace std;
int main(){
	string s;
	cin>>s;
	for(int i=0;i<s.size();i++){
		if(s[i]=='a'||s[i]=='e'||s[i]=='i'||s[i]=='o'||s[i]=='u'){
			cout<<i+1;
			return 0;
		}
	}
	cout<<0;
	return 0;
}

/**************************************************************
	Problem: 1844
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:35 ms
	Memory:2076 kb
****************************************************************/