oracle failed on case 3: runtime error: exit status 2
panic: runtime error: index out of range [-1]

goroutine 1 [running]:
main.main()
	/tmp/cf-worker-1794390475/1858E1.go:52 +0x8e4

input:
15
+ 420494
+ 663303
!
- 2
+ 799488
?
!
!
- 1
+ 790150
+ 317581
+ 709629
!
+ 596549
?