n = list(map(int,input()))
temp = n[:]

mx1 = max(n)
a = n.index(mx1)

temp[0] = mx1
temp[a] = n[0]
temp2 = temp[:]

mx2 = max(temp[1:])
b = temp[1:].index(mx2)

temp2[1] = mx2
temp2[b+1] = temp[1]
ans = list(map(str, temp2))
print("".join(ans))