@echo off
setlocal enabledelayedexpansion
set n=1
for /f "delims=" %%i in ('dir /b /a-d ^| findstr "SKMBT"') do (
    if !n! equ 1 (
        ren "%%i" "3%%~xi"
    ) else if !n! equ 2 (
        ren "%%i" "12%%~xi"
    ) else if !n! equ 3 (
        ren "%%i" "4%%~xi"
    )
    set /a n+=1
)
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3
12
4
cls&echo off
(for /f "delims=" %%i in ('dir /b /a-d ^| find "SKMBT"') do (
  set /p n=
  rem 无误去掉下句的echo
  call echo ren "%%i" "%%n%%%%~xi"
))<"%~f0"
pause
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