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
    flag = False
    for x in range(32, 100):
        if x * x == n:
            flag = True
            break
    if not flag : continue
    print(n)