What does this Assembly snippet output?

1.global _main
2.align 2
3_main:
4    stp x29, x30, [sp, #-32]!
5    mov w8, #15
6    mov w9, #4
7    add w10, w8, w9
8    sub w11, w8, w9
9    sub sp, sp, #16
10    str x10, [sp]
11    str x11, [sp, #8]
12    adrp x0, fmt@PAGE
13    add x0, x0, fmt@PAGEOFF
14    bl _printf
15    add sp, sp, #16
16    ldp x29, x30, [sp], #32
17    mov w0, #0
18    ret
19.section __TEXT,__cstring
20fmt: .asciz "%d %d\n"