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

void rearrangeString(char *s) {
    
    char Letters[] = "leadinguniversity";
    int Count[26] = {0}; 

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

    
    for (int i = 0; i < strlen(Letters); i++) {
        if (Count[Letters[i] - 'a'] == 0) {
            printf("Impossible\n");
            return;
        }
    }

    printf("Leading University\n");
}

int main() {
    char s[100]; 
    scanf("%s", s);

    rearrangeString(s);

    return 0;
}