public class Num1874{
	public static void main(String[] args) throws Exception {
		// Scanner 객체보다 빠르게 하기 위해 사용. 한 줄을 통째로 입력받는다.
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder(); // String 연산 시간을 줄이기 위해 사용
 
		int n = Integer.parseInt(br.readLine()); // 입력할 숫자 갯수
 
		int temp; // 입력한 값
		int max = 0; // stack안에서 제일 큰 값
		int top = 0; // stack에서 최상단에 있는 값
		int[] stack = new int[n];
 
		while(n-- > 0){ // 입력받은 값의 수가 0보다 클 때 까지
			temp = Integer.parseInt(br.readLine());
			if(temp > max){
				// 스택에 값이 없을 경우
				for(int i=max+1; i<=temp; i++){
					stack[top++] = i;
					sb.append("+\n"); // push
				}
				max = temp;
			}else if(stack[top-1] != temp) { // 종료조건을 확인하기 위해
				System.out.println("NO");
				return; // 아예 메소드를 종료시켜야 하기때문에 break을 쓰지 않는다.
			}
			// 무조건 한번은 pop을 하기 때문에
			top--;
			sb.append("-\n"); // pop
		}
		System.out.println(sb);
	}
}

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