#include <stdio.h>
main()
{
	int i=-1,j=1,k=0,l=0,m=0,n=0,failed=0;
	char word[30],revieled[30],a,b=0;
	while(word[i]!='\n')
	{
		i++;
		word[i]=getch();
	}
	revieled[0]=word[0];
	while(j<i) 
	{
		if(word[j]==word[0])
			revieled[j]=word[j];
		else if(word[j]==word[i-1])
			revieled[j]=word[j];
		else
		{
			revieled[j]='_';
			k++;
		}
		for(n=j+1;n<i;n++)
		{
			if(word[j]==word[n])
			{
				m--;
				n=i;
			}
		}
		j++;
	}
	revieled[j]='\0';
	printf("%s\n",revieled);
	while(failed<k)
	{
		l++;
		a=getch();
		for(j=1;j<i-1;j++)
		{
			if(a==word[j])
			{
				revieled[j]=word[j];
				b=1;
			}
		}
		if(b==1)
		{
			printf("%s\n",revieled);
			b=0;
		}
		else
			failed++;
	}
}