from operator import itemgetter

def main():
    N = input()
    rev = sorted(enumerate(N), reverse=True, key=itemgetter(0, 1))
    a = b = 0
    for i in range(len(N)):
        if N[i] != rev[i][1]:
            a, b = i, rev[i][0]
            break
    ans = list(N)
    ans[a], ans[b] = ans[b], ans[a]
    print(''.join(ans))

main()