X = list(input())
X.sort(reverse=True)
X_changed = X[-2:]
X_changed.append(X[-1])
X_changed.append(X[-2])
if X_changed[0] == "0":
    print(-1)
elif int("".join(X_changed)) == int("".join(X)):
    print(-1)
else:
    print(X_changed)