s = input("Enter your letter :")
for l in s:
    a1 = 1
for e in s:
    b1 = 0
for a in s:
    c1 = 0
for d in s:
    d1 = 0
for i in s:
    e1 = 0
for n in s:
    f1 = 0
for g in s:
    g1 = 0
for u in s:
    h1 = 0
for n in s:
    i1 = 0
for i in s:
    j1 = 0
for v in s:
    k1 =0
for e in s:
    l1 = 0
for r in s:
    m1 = 0
for s in s:
    n1 = 0
for i in s:
    o1 = 0
for t in s:
    p1 = 0
for y in s:
    q1 = 0

if a1==0 and b1==0 and c1==0 and d1==0 and e1==0 and f1==0 and g1==0 and h1==0 and i1==0 and j1==0 and k1== 0 and l1==0 and m1==0 and n1==0 and o1==0 and p1==0 and q1==0:
    print("Leading University")
else:
    print("Impossible")