qixiaobin0715

@echo off
set /p char=<a.txt
set n=0
:o
if not "%char%"=="" (
    set /a n+=1
    set char=%char:~1%
    goto :o
)
set /a n-=1
setlocal enabledelayedexpansion
for /l %%b in (0,1,%n%) do (
    for /f "delims=" %%a in (a.txt) do (
        set "str=%%a"
        set str%%b=!str%%b!!str:~%%b,1!
    )
    echo !str%%b!
)
pause
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