INTPROD

#include <iostream>
#include <string>
#include <cctype>
#include <cstdio>
#include <cstdlib>
using namespace std;
const int imax = 1<<18;
const int level = 1<<17;
int tres[imax];

void updateAll() {
    for (int i = level-1; i > 0; i--) {
        tres[i] = tres[2*i]*tres[2*i+1];
    }
}

void mod (int pos, int val) {
    val = (val > 0)?1:(val<0)?-1:0;
    //cout << "modded " << pos<<" "<<val<<endl;
    tres[level+pos] = val;
    int tcal = (level + pos)/2;
    while (tcal > 0) {
        tres[tcal] = tres[tcal*2] * tres[tcal*2+1];
        tcal/=2;
    }
}

int get(int beg, int end) {
    if (beg == end)
        return tres[level+beg];
    beg += level;
    end += level;
    int lval = tres[beg];
    int rval = tres[end];
    //cout << "l: " << beg << " " << lval << "  r:" << end << " " << rval << endl;
    while (beg/2 != end/2) {
        if (beg%2 == 0) {
            lval *= tres[beg+1];
        }
        if (end%2 == 1) {
            rval *= tres[end-1];
        }
        beg/=2;
        end/=2;
    }
    return lval*rval;
}

int main()
{
    //cout << (1<<17) << " " << (1<<18) << endl;
    while (cin.peek() != EOF) {
        int n, k;
        cin >> n >> k;
        for (int i = 0; i < imax; i++) {
            tres[i] = 0;
        }
        for (int i = 0; i < n; i++) {
            int tmp;
            cin >> tmp;
            tres[level+i] = (tmp<0)?-1:(tmp>0)?1:0;
        }
        updateAll();
        string con;
        for (int i = 0; i < k; i++) {
            char c;
            int a, b;
            cin >> c >> a >> b;
            if (c == 'C') {
                mod(a-1, b);
            }
            else {
                int tst = get(a-1,b-1);
                con += (tst<0)?'-':(tst>0)?'+':'0';
            }
        }
        cout << con << endl;
        cin >> ws; // purge ws
    }
    return 0;
}