int main() {
    int n, q;
    while (cin >> n >> q) {
        splay<int> t;
        for (int i = 0; i < n; i++) {
            int x; cin >> x;
            if (x) x = x > 0 ? 1 : -1;
            t.push_back(x);
        }
        while (q--) {
            char c; cin >> c;
            if (c == 'C') {
                int i, x; cin >> i >> x;
                if (x) x = x > 0 ? 1 : -1;
                t[i-1] = x;
            } else {
                int a, b; cin >> a >> b;
                int val = t.query(a-1, b-1);
                if (val > 0) cout << '+';
                else if (val < 0) cout << '-';
                else cout << 0;
            }
        }
        cout << endl;
    }
    return 0;
}