import sys
input=sys.stdin.readline
while True: # try-except가 있어야 break로 빠져나올 수 있음
    try:
        n=int(input().strip())
        sum=0
        for i in range(n):
            a=int(input().strip())
            sum+=a
        if sum == 0:
            print(0)
        elif sum > 0:
            print('+')
        else:
            print('-')
    except:
        break