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lambda s,k:''.join(sorted`sorted(s,key=lambda c:[k`k.index(3-ord(c)/32),c])`+c)`[2::5]
Test it on Ideone.
lambda s,k:''.join(sorted(s,key=lambda c:[k.index(3-ord(c)/32),c]))
lambda s,k:`sorted(s,key=lambda c:`k.index(3-ord(c)/32)`+c)`[2::5]
