X=list(map(int,list(input())))
variation=len(set(X))
size_list=sorted(list(set(X)),reverse=True)

if variation>=3:
    X.sort(reverse=True)
    border_num = size_list[-2]
    border_idx= [i for i, x in enumerate(X) if x == border_num][-1]
    X[border_idx],X[border_idx+1]=X[border_idx+1], X[border_idx]
    print(''.join(list(map(str,X))))
elif variation==2:
    if 0 in X and X.count(0)==len(X)-1:
        print(-1)
    else:
        X.sort(reverse=True)
        border_num = size_list[-2]
        border_idx = [i for i, x in enumerate(X) if x == border_num][-1]
        X[border_idx], X[border_idx + 1] = X[border_idx + 1], X[border_idx]
        print(''.join(list(map(str, X))))
elif variation==1:
    print(-1)