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#include<stdio.h>
#include<strings.h>
int main()
{
	char a[20];
	char b[20];
	int i;
	char* p=a;
	char* q=b;
	printf("enter the first array:\n");
	for(i=0;i<20;++i)
		scanf("%c",&a[i]);
	printf("enter the second array:\n");
	for(i=0;i<20;++i)
		scanf("%c",&b[i]);
	while(p!=NULL && q!=NULL)
	{
		if(*p=*q)
		{
			printf("%c",*p);
		}	
		p++;
		q++;
	}

	return 0;
}