addi sp, sp, -26
	move t8, a0
	move t9, sp

	move t0, t9
	addi t1, t0, 26
fillzero:
	stb  zero, 0(t0)
	addi t0, t0, 1
	bne  t0, t1, fillzero

loop:
	ldb  t0, 0(t8)
	beq  t0, zero, finish
	addi t8, t8, 1

	addi t0, t0, -65
	bltz t0, finish
	addi t1, t0, -65+26
	bgez t1, finish

	add  t0, t9, t0
	ldb  t1, 0(t0)
	addi t1, t1, 1
	stb  t1, 0(t0)
	j    loop

finish:
	addi sp, sp, 26
	jr   ra