#include <iostream>
using namespace std;
 
int main() {
   int c1,c2,n,p,i,a[100];
   cout<<"Dati un numar n: ";
   cin>>n;
   cout<<"Dati cifra care doriti sa o modificati : ";
   cin>>c1;
   cout<<"Dati cifra cu care doriti sa inlocuiti c1: ";
   cin>>c2;
   p=n;
   if(n==0)
   {
		return 0;
   }
   if ((0<=c1)&&(c1<=9)&&(0<=c2)&&(c2<=9)&&(0<=n)&&(n<=100000))
	   for (i=1;i<=6;i++)
	   {
			if (p%10==c1)
			{
				a[i]=1;
			}
			p=p/10;
	   }
	for (i=6;i>=1;i--)
		if (a[i]==1)
		{
			p=n%((i)^10);
			n=n/(i*10);
			n=(n*10+c2)*((i)^10)+p;
		}
	cout<<n;
	return 0;
}