#include <bits/stdc++.h>
using namespace std;

using ll = long long;

void solve() {
    auto valid = [&](int x, int y) {
        return 0 <= x && x < 10 && 0 <= y && y < 9;
    };
    auto getTo = [&](int x, int y, int ty) {
        vector<pair<int, int>> tmp;
        if(ty == 0) {
            for(int i = -1; i <= 1; i += 2) {
                tmp.push_back({x + i, y});
                tmp.push_back({x, y + i});
            }
        } else if(ty == 1) {
            for(int i = -1; i <= 1; i += 2) {
                for(int j = -1; j <= 1; j += 2) {
                    tmp.push_back({x + i, y + j});
                }
            }
        } else if(ty == 2) {
            for(int r = 0; r < 10; r++) if(r != x) tmp.push_back({r, y});
            for(int c = 0; c < 9; c++) if(c != y) tmp.push_back({x, c});
        } else if(ty == 3) {
            for(int i = -2; i <= 2; i += 4) {
                for(int j = -1; j <= 1; j += 2) {
                    tmp.push_back({x + i, y + j});
                    tmp.push_back({x + j, y + i});
                }
            }
        } else if(ty == 4) {
            for(int i = -2; i <= 2; i += 4) {
                for(int j = -2; j <= 2; j += 4) {
                    tmp.push_back({x + i, y + j});
                }
            }
        } else {
            tmp.push_back({x + 1, y});
            if(x > 4) {
                tmp.push_back({x, y + 1});
                tmp.push_back({x, y - 1});
            }
        }
        vector<pair<int, int>> res;
        for(auto [x, y] : tmp) if(valid(x, y)) res.push_back({x, y});
        return res;
    };
    vector f(10, vector(9, vector(6, vector(10, vector(9, -1)))));
    for(int i = 0; i < 10; i++) {
        for(int j = 0; j < 9; j++) {
            for(int ty = 0; ty < 6; ty++) {
                auto &g = f[i][j][ty];
                queue<pair<int, int>> q;
                q.push({i, j});
                g[i][j] = 0;
                while(q.size()) {
                    auto [x, y] = q.front(); q.pop();
                    for(auto [tx, ty] : getTo(x, y, ty)) {
                        if(g[tx][ty] == -1) {
                            g[tx][ty] = g[x][y] + 1;
                            q.push({tx, ty});
                        }
                    }
                }
            }
        }
    }
    string ans = "JSCMXB";
    int n;
    cin >> n;
    vector<array<int, 3>> A;
    for(int i = 0; i < n; i++) {
        int x, y;
        cin >> x >> y;
        for(int j = 0; j < 6; j++) {
            A.push_back({x, y, j});
        }
    }
    while(1) {
        using T = unordered_map<int, vector<array<int, 3>>>;
        auto get = [&](int i, int j) {
            T res;
            for(auto [x, y, ty] : A) {
                res[f[x][y][ty][i][j]].push_back({x, y, ty});
            }
            return res;
        };
        auto eval = [&](T mp) -> pair<int, int> {
            if(mp.size() == 0) return {1e9, 1e9};
            pair<int, int> mx = {-1, -1};
            for(auto [k, v] : mp) {
                int sz = v.size();
                set<int> tys;
                for(auto [x, y, ty] : v) tys.insert(ty);
                mx = max(mx, {(int)tys.size(), sz});
            }
            return mx;
        };
        T mp;
        int qx, qy;
        for(int i = 0; i < 10; i++) {
            for(int j = 0; j < 9; j++) {
                auto now = get(i, j);
                if(eval(mp) > eval(now)) {
                    mp = now;
                    qx = i, qy = j;
                }
            }
        }
        cout << "? " << qx << ' ' << qy << endl;
        int res;
        cin >> res;
        A = mp[res];
        set<int> tys;
        for(auto [x, y, ty] : A) tys.insert(ty);
        if(tys.size() == 1) {
            cout << "! " << ans[*tys.begin()] << endl;
            break;
        }
    }
}
signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    int t = 1;
    // cin >> t;
    while(t--) solve();
    return 0;
}