N = input()
ln = len(N)
n = int(N)

mx, mi = 0,10
px, pi = -1, -1
for i in range(ln):
    if int(N[i]) >= mx:
        mx = int(N[i])
        px = i
    if int(N[i]) < mi:
        mi = int(N[i])
        pi = i

M = [0 for _ in range(ln)]

for i in range(ln):
    if i == 0:
        M[0] = mx
    elif i == px:
        M[i] = N[0]
    else:
        M[i] = N[i]

for i in range(ln):
    print(M[i], end='')
print()