Code-breaking: a man named "pig gang" of countries, using a simple grammar encryption, they use language which only capital letters, no other characters now know that their encryption method is: only one capital letter and the original XOR the ciphertext. Please help solve.

poyimima\Debug\poyimima.exe
........\.....\poyimima.ilk
........\.....\poyimima.obj
........\.....\poyimima.pch
........\.....\poyimima.pdb
........\.....\vc60.idb
........\.....\vc60.pdb
........\poyimima.c
........\poyimima.dsp
........\poyimima.dsw
........\poyimima.ncb
........\poyimima.opt
........\poyimima.plg
........\Debug
poyimima

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