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

int main(){

    int a, count = 0;
    char word[500];

    scanf("%s", word);

    char com[100] = "leadinguniversity";
    int len = strlen(word);

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

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

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