from collections import defaultdict

def main():
    X = input()
    if len(set(X)) == 1:
        print(-1)
        exit()
    if ('0' in set(X)) and (len(set(X)) == 2):
        print(-1)
        exit()
    
    d = defaultdict(int)
    for x in X:
        d[x] += 1

    ans = ""
    cnt = 0
    second = -1
    length = len(d)
    for key in sorted(d.keys(), reverse=True):
        if cnt == length - 2:
            ans += key * (d[key] - 1)
            second = key
        elif cnt == length - 1:
            ans += key
            ans += second
            ans += key * (d[key] - 1)
        else:
            ans += key * d[key]
        cnt += 1
    
    print(ans)
        

    



    



if __name__ == "__main__":
    main()