#include <iostream>

using namespace std;

int main()
{
    string s;
    cin >> s;

    int minAbility = 1, temp=1;

    if(s.size() == 1){
       if(s[0] != 'A' && s[0] != 'E' && s[0] != 'I' && s[0] != 'O' && s[0] != 'U' && s[0] != 'Y'){
            //cout<<2<<endl;
            minAbility = 2;
       }
       else{
        //cout<<1<<endl;
            minAbility = 1;
       }

        cout << minAbility << endl;

        return 0;
    }

    for(int i = 0; i < s.size(); i++){
        //temp = 0;
       // if(i==0){
            int j = i;
            while(s[j] != 'A' && s[j] != 'E' && s[j] != 'I' && s[j] != 'O' && s[j] != 'U' && s[j] != 'Y'){
                temp++;
                if(j >= s.size())
                    break;
                j++;
            }
            //cout << temp<<endl;
            i = j;
            if(temp>minAbility)
                minAbility = temp;
            temp = 1;
            //continue;
        //}
        //cout<<i<<endl;
    }
    //cout<<i;
    cout << minAbility << endl;

    return 0;
}