#include <stdio.h>
#include <string.h>

int main() {
    char s[105]; 
    int freq[26] = {0}; 
    scanf("%s", s);

    
    for (int i = 0; i < strlen(s); i++) {
        freq[s[i] - 'a']++;
    }

   
    if (freq['l' - 'a'] >= 2 && freq['e' - 'a'] >= 2 && freq['a' - 'a'] >= 1 &&
        freq['d' - 'a'] >= 1 && freq['i' - 'a'] >= 2 && freq['n' - 'a'] >= 2 &&
        freq['g' - 'a'] >= 1 && freq['u' - 'a'] >= 1 && freq['v' - 'a'] >= 1 &&
        freq['r' - 'a'] >= 1 && freq['s' - 'a'] >= 1 && freq['t' - 'a'] >= 1 &&
        freq['y' - 'a'] >= 1) {
        printf("Leading University\n");
    } else {
        printf("Impossible\n");
    }

    return 0;
}