#include <stdio.h>
#include <string.h>
char *itoa( int val, char *a, int radix )
{
 char *p = a;
 unsigned int v = val;
 int n = 1;
 while(v >= radix){
   v /= radix;
   n++;
 }
 p = a + n;
 v = val;
 *p = '\0';
 do {
   --p;
   *p = v % radix + '0';
   if(*p > '9') {
     *p = v % radix - 10 + 'A';
   }
   v /= radix;
 } while ( p != a);
 return a;
}
int main(){
  int N;
  int i;
  int max=0;
  char buf[10];
  int len;
  int tmp;
  scanf("%d",&N);
  itoa(N,buf,10);
  len=strlen(buf);
  for(i=1;i<len;i++){
    if(buf[max]<=buf[i])max=i;
  }
  tmp=buf[0];
  buf[0]=buf[max];
  buf[max]=tmp;
  
  printf("%s\n",buf);
  
  return 0;
}