.data
var1: .byte 'm'
var2: .byte 'i'
var3: .byte 'p'
var4: .byte 's'
var5: .byte 0

.text
.globl main
.ent main
main:
    lb      $t1,    var1
    sub     $t1,    $t1,    32
    sb      $t1,    var1

    lb      $t1,    var2
    sub     $t1,    $t1,    32
    sb      $t1,    var2

    lb      $t1,    var3
    sub     $t1,    $t1,    32
    sb      $t1,    var3

    lb      $t1,    var4
    sub     $t1,    $t1,    32
    sb      $t1,    var4

    la      $a0,    var1
    li      $v0,    4
    syscall 

    li      $v0,        10
    syscall 
    .end main