#include <stdio.h>
#include <stdlib.h>

int main()
{
  char s1[ 1000 ], s2[ 1000 ];
  int n;
  char *insert( char *, char *, int );

  while ( scanf( "%s%s%d", s1, s2, &n ) != EOF )
  {
    char *p = insert( s1, s2, n );
    puts( p );
    free( p );
  }
  return EXIT_SUCCESS;
}