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#include<stdio.h>

char main()
{
	char a1[20],a2[20], *s,*t;
	s=a1;
	t=a2;
	scanf("%s %s",s,t);

	while(  *t !='\0')
	{	
		t++;
		if(*s = *t)
		{
			s++;
			printf("%c",*t);
		}	
		
	}
		
	
	
			
}