If the left image shows one wolf standing on a non-snowy ground, and the right image shows one wolf standing on snowy ground.
return the  left image  ;return wolves in  #1 ;return ground in  #1 ;return #3 that is non-snowy ;return #2 standing  on #4 ;return number of  #5 ;return if  #6 is equal to  one ;return the  right image  ;return wolves in  #8 ;return ground in  #8 ;return #10 that is snowy ;return #9 standing  on #11 ;return number of  #12 ;return if  #13 is equal to  one ;return if  both  #7 and #14 are true
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