import copy
n=list(input())
ans=[]
ans.append(int(''.join(n)))
for i in range(len(n)):
  for j in range(len(n)):
    l=copy.copy(n)
    if i!=j:
      l[i],l[j]=l[j],l[i]
      ans.append(int(''.join(l)))
print(max(ans))