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1874.java
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1874.java
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
class Stack {
int top = 1;
int high = 1;
int[] st;
public Stack(int n) {
st = new int[n];
}
char push(int x) {
st[top++] = x;
high++;
return '+';
}
char pop() {
st[--top] = 0;
return '-';
}
}
public class Main {
public static void main(String[] args) throws NumberFormatException, IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringBuilder bb = new StringBuilder();
int n = Integer.parseInt(br.readLine());
boolean bool = true;
Stack stack = new Stack(n + 1);
for (int i = 0; i < n; i++) {
int m = Integer.parseInt(br.readLine());
for (int j = stack.high; j <= m; j++) {
bb.append(stack.push(j));
}
if (m == stack.st[stack.top - 1]) {
bb.append(stack.pop());
} else {
bool = false;
System.out.println("NO");
break;
}
}
if (bool) {
for (int i = 0; i < bb.length(); i++) {
System.out.println(bb.charAt(i));
}
}
}
}