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#include<stdio.h>
void main()
{
  int ctr=0,i=0,j;
  char s1[50],s2[50],a[50],*ptr;
  char *p=s1;
  char *q=s2;
  scanf("%s",s1);
  scanf("%s",s2);
  while (*p!='\0')
  {
     
     while(*q!='\0')
	
      {
        if(*p==*q)
          {  
	     ctr++;
            a[i]=*p;
         	
         }  
        
        p++;
        q++;
        
      }
      i++;
      q=s2;
      
   }
   for(i=0;i<ctr;i++)
       {
         for(j=i+1;j<ctr;j++);
           {  if(a[i]!=a[j])
               printf("%c",a[j]);
           }
        }
}