f=[99*["-"]for i in"*"*99] try: while 1:z=raw_input().split();f[int(z[1])+9][int(z[0])+9]=z[2] except:exec'f=zip(*f)[::-1]\nwhile len(set(f[0]))<2:del f[0]\n'*4 for z in f:print`z`[2::5]
Note that non-ascii characters in the above source code will be escaped (such as \x9f).