#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: wenda
	Language: C++
	Result: Accepted
	Time:33 ms
	Memory:2076 kb
****************************************************************/