oracle failed on case 4: runtime error: exit status 2
panic: runtime error: index out of range [-1]

goroutine 1 [running]:
main.main()
	/tmp/cf-worker-1170535592/1858E2.go:55 +0x7d8

input:
19
+ 989637
!
+ 643950
!
?
?
?
- 1
?
+ 571728
+ 323232
+ 660488
+ 667648
!
?
+ 590219
+ 209707
- 5
+ 419312