X = list(str(input()))
intX = [int(x) for x in X]
intX.sort()
intX.reverse()
listX = list(itertools.permutations(intX, len(intX)))
if len(set(listX)) <= 1:
    print(-1)
    exit()
for i in range(len(X)):
    if listX[1][0] == 0:
        print(-1)
        exit()
    else:
        print(listX[1][i],end="")