#include<stdio.h>
#include<stdlib.h>
int main(){
	 char *ch, s1[100],s2[100];
	 int i,j;
	 ch=s1;
	 printf("enter the first string\n"); 
	 gets(s1);
	 printf("enter the second string\n");
	 gets(s2);
	 	for(i=0;s1[i]!='\0';i++)
		while(s1[i]!=s2[j])
		fputs(ch,s1);
		s1[i]=s2[j];
		printf("%s",s1);		
		return 0;
}