s = input()
ss = []
cf = []
for i in s:
    for j in ss:
        if (i == j):
            cf.append(i)
    ss.append(i)
if (len(cf) > 0):
    print("True")
    for i in cf:
        print(i, end="")
else:
    print("False")

#code by Luthics