three piece puzzle by nu (tails)

short x,y,u;main(w){for(;~scanf("%s%s%s",&x,&y,&u);puts(&x))for(;index(&y,w=x)?x=y:index(&u,w=y);u=w)y=u;}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

To protect the system from spam, please input your favorite sport (hint: I believe its name must start with 'g', case insensitive)

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