#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <stack>
#include <iomanip>
#include <fstream>
#include <string>
#include <set>
#include <deque>
#include <queue>
#include <map>
#include <bitset>
#include <random>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef string str;
//typedef __int128 ultraint;
#define endl "\n"
#define sqrt sqrtl

const ll inf = (ll)1e18 + 7;

ld eps = 1e-12;

vector <int> p(1000005);
int mas[3][1000005];
int res[1000005];

int ask(int n)
{
    if (n == p[n])
    {
        return n;
    }

    return p[n] = ask(p[n]);
}

void cut(int x, int y)
{
    int x1 = ask(x);
    int y1 = ask(y);

    p[x1] = y1;

    return;
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int n, m, q;
    cin >> n >> m >> q;

    vector <vector<int>> gr(100000);

    for (int i = 0; i < m; i++)
    {
        int a, b;
        cin >> a >> b;

        gr[a].pb(b);
        gr[b].pb(a);
    }

    for (int i = 0; i < q; i++)
    {
        string s;
        cin >> s;

        int a, b;
        cin >> mas[1][i] >> mas[2][i];

        if (s == "ask")
        {
            mas[0][i] = 1;
        }
        else
        {
            mas[0][i] = 0;
        }
    }

    for (int i = 1; i <= n; i++)
    {
        p[i] = i;
    }

    for (int i = q - 1; i >= 0; i--)
    {
        if (mas[0][i] == 1)
        {
            int lol = ask(mas[1][i]);
            int kek = ask(mas[2][i]);

            res[i] = (lol == kek);
        }
        else
        {
            cut(mas[1][i], mas[2][i]);
        }
    }

    for (int i = 0; i < q; i++)
    {
        if (mas[0][i] == 1)
        {
            if (res[i] == 1)
            {
                cout << "YES" << endl;
            }
            else
            {
                cout << "NO" << endl;
            }
        }
    }

    return 0;
}