#include<conio.h>
#include<iostream.h>
#include<math.h>
//Spiridon Rudolf
long n,x,i,a,inv=0;
void main()
{
clrscr();
cout<<"hai sa scoatem o cifra dintrt-un nr."<<endl;
cout<<"n=";
cin>>n; 
cout<<"a cata cif. vreti sa o scoatem? =";
cin>>a;
while(n)
 {
 inv=inv*10+n%10;
 n=n/10;
 }

i=pow(10,a-1);
x=inv%i;
inv=inv/i;
inv=inv/10;
inv=inv*i+x;

while(inv)
 {
 n=n*10+inv%10;
 inv=inv/10;
 }
cout<<n;
getch();

}