@echo on&setlocal enabledelayedexpansion
set n=0
for /f usebackq delims= %%b in (a.txt) do (
set /a n+=1
if !n! equ 1 ( 
set var=%%b
echo %var%
echo !var:%var:~36,12%=!>>ok.txt
) else (
echo %%b>>ok.txt
)
 )
 
pause
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