zerojudge e457

#include <bits/stdc++.h>
#define IO ios_base::sync_with_stdio(false);cin.tie(0);

using namespace std;

int main()
{
    IO
    int a, b;
    while(cin >> a >> b)
    {
        int *input = new int[a];
        for(int i = 0; i < a; ++i)
        {
            int temp;
            cin >> temp;
            if(temp > 0)
                input[i] = 1;
            else if(temp < 0)
                input[i] = -1;
            else
                input[i] = 0;
        }
        for(int i = 0; i < b; ++i)
        {
            char request;
            int num1, num2;
            cin >> request >> num1 >> num2;
            if(request == 'C')
            {
                if(num2 > 0)
                    num2 = 1;
                else if(num2 < 0)
                    num2 = -1;
                else
                    num2 = 0;
                input[num1 - 1] = num2;
            }
            else if(request == 'P')
            {
                int temp = 1;
                for(int i = num1 - 1; i <= num2 - 1; ++i)
                    temp *= input[i];
                if(temp == 1)
                    cout << "+";
                else if(temp == -1)
                    cout << "-";
                else if(temp == 0)
                    cout << "0";
            }
        }
        cout << '\n';
    }
    return 0;
}