[文本处理] [求助]如何在文本中插入符号

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in (a.txt) do (
  set num=&set "str=%%a"
  call :loop 
)
pause&exit
:loop
set num=!num!!str:~0,2!+
set str=!str:~2!
if defined str goto loop
echo !num:~0,-1!
goto :eof
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