@echo off&setlocal enabledelayedexpansion
for %%a in (1 2 3) do (
  set n=0
  for /f "delims=" %%b in (%%a.txt) do (
    set "#!n!=%%b"
    set/a n+=1
  )
  set/a #r=!random!%%!n!
  for %%c in (!#r!) do set "str=!str!!#%%c!"
  for /l %%d in (0,1,!n!) do set "#%%d="
)
echo %str%
pause
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