from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    X = input()

    X = sorted(X, reverse=1)
    for i in range(len(X) - 1, 0, -1):
        if X[i] != X[i-1]:
            X[i], X[i-1] = X[i-1], X[i]
            if X[0] != '0':
                print(''.join(X))
            else:
                print(-1)
            break
    else:
        print(-1)


main()