N = input()
NN = len(N)
A = [int(a) for a in N]
for i in range(NN):
    maxa = 0
    maxi = 0
    for j in range(NN - i):
        if A[i + j] >= maxa:
            maxa = A[i + j]
            maxi = i + j
    if maxi == i:
        continue
    A[maxi], A[i] = A[i], A[maxi]
    break
print("".join([str(a) for a in A]))