#include<stdio.h>
int reverse(unsigned int n);
int p_10(unsigned int x);
unsigned int n;
int main(void)
{ unsigned int hk;
  
  hk=12345;
   
  printf("%d",reverse(hk));
  printf("\n");

 return 0;
}

int reverse(unsigned int n )
{ unsigned int k=0;
 
 if(n>10){
   k=(n%10)*p_10(n)+reverse(n/10);
 }else k=n;
  
 return k; 

}

int p_10(unsigned int x)
{  int i=0;
int j=1;
 x=x/10;
 for(;x!=0;i++){
  x=x/10;
 
 }
  for( j=1;i!=0;--i){j=j*10;}
return j;
}