X = list(str(input()))
X = sorted(X, reverse=True)
setX = set(X)
if len(setX) <= 1 or len(X) - X.count("0") <= 1:
    print(-1)
    exit()

minX = min(setX)
cntMin = X.count(minX)
X[-1*cntMin-1],X[-1*cntMin] = X[-1*cntMin],X[-1*cntMin-1]
for x in X:
    print(x,end="")