#include <bits/stdc++.h>

using namespace std;

int main() {
    //输入+输出重定向
    freopen("../1124.txt", "r", stdin);

    string s;
    cin >> s;

    int m = INT32_MIN;
    unordered_map<char, int> _map = {{'A', 1},
                                     {'E', 1},
                                     {'I', 1},
                                     {'O', 1},
                                     {'U', 1},
                                     {'Y', 1}};
    int start = 0;
    for (int i = 0; i < s.size(); ++i) {
        if (_map.count(s[i]) > 0) {
            if (i - start > m) {
                m = i - start ;
                start = i;
            }
        }
    }
    cout << m-1<< endl;
    //关闭文件
    fclose(stdin);
    return 0;
}