import itertools
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()

maxX = max(setX)
cntMax = X.count(maxX)
X[cntMax-1],X[cntMax] = X[cntMax],X[cntMax-1]
for x in X:
    print(x,end="")