import math

for n in range(1100, 9999 + 1):
    a = int(n / 1000)
    b = int(n % 1000 / 100)
    c = int(n % 100 / 10)
    d = n % 10
    if a != b or c != d: continue
    x = int(math.sqrt(n))
    if x * x == n:
        print(n)