r=raw_input r() p={} def f(x): if x!=p.get(x,x):p[x]=x=f(p[x]) return x while 1: q,a,b=map(f,r().split()) if'0'<q:print'YNEOS'[a!=b::2] else:p[a]=b
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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