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| #include<bits/stdc++.h>
#define IOS std::ios::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)
using namespace std;
const int N = 100003;
int h[N], e[N], ne[N], idx;
void insert(int x){ int k = (x % N + N) % N; e[idx] = x, ne[idx] = h[k], h[k] = idx ++; }
bool find(int x){ int k = (x % N + N) % N; for (int i = h[k]; i != -1; i = ne[i]){ if (e[i] == x) return true; } }
int main(){ int n; cin >> n; memset(h, -1, sizeof h);
while (n --){ char op[2]; int x;
scanf("%s%d", op, &x);
if (*op == 'I') insert(x); else{ if (find(x)) puts("Yes"); else puts("No") } } return 0; }
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