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

int main(){

    int count = 0;
    char word[100];

    scanf("%s", word);

    char com[17] = "leadinguniversity";
    int len = strlen(word);

    for(int i = 0; i <= 16; i++){
        for ( int j = 0; j < len; j++){
            if (com[i] == word[j] ){
                count++;
                word[j] = 'm';
                break;
            }
        }
    }

    if (count == 17 ){
        printf("Leading University\n");
    }

    else{
        printf("Impossible\n");
    }
    return 0;
}