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#include<stdio.h>
#include<stdlib.h>
void main()
{
	char str[50],str1[50],*p,*p1;
	int i=0,j=0,k;
	scanf("%s",str);
	scanf("%s",str1);
	p=str;
	p1=str1;
	while(str[i]!='\0')
	i++;
	
	while(str1[j]!='\0')
	j++;

	for(i=0;i<j;i++)
		{
			if(str[i]==str1[i])
			continue;
			else
			break;
		}
		if(i==j)
			printf("%s",str);
		
		else
		{	k=0;
			i=0;
			while(str[k]!='\0')
			{
				*p=str[k];
				p++;
				k++;
			}
			while(str1[i]!=0)
			{	
				*p=str1[i];
				p++;
				i++;
			}
		*p='\0';
		printf("%s\n",str);
		}
}