n = int(input())
sequence = [int(input()) for _ in range(n)]
stack = []
operator = []
idx_seq = 0
idx_num = 1

while idx_seq < n :
    if stack and stack[-1] == sequence[idx_seq] :
        operator.append('-')
        stack.pop()
        idx_seq += 1
    else :
        if idx_num > n :
            print("NO")
            break
        operator.append('+')
        stack.append(idx_num)
        idx_num += 1
else :
    print('\n'.join(operator))