a,b=gets.split(' ').map{|i|i.to_i}\x0d o=u=1\x0d a.times{\x0d o=u\x0d t=[]\x0d b.times{\x0d t<<o.to_s\x0d o=-o+1\x0d }\x0d puts t*" "\x0d u=-u+1\x0d }
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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