name = ['l','e','a','d','i','n','g','u','n','i','v','e','r','s','i','t','y']
n = input()
l1 = len(name)
count = 0
for s1 in n:
    if s1 in name:
        count = count + 1
        name.remove(s1)
if count == l1:
    print("Leading University")
else:
    print("Impossible")