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

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x...)
#endif

using ll = long long;
using ull = unsigned long long;
using db = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pdd = pair<db, db>;
using tiii = tuple<int, int, int>;
using str = string;

#define vt vector
#define pb push_back
#define eb emplace_back
#define ins insert
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)x.size()

#define mp make_pair
#define mt make_tuple
#define fi first
#define se second

struct segtree {

    vt<int> tree;
    int size;

    int NO_OPERATION = INT_MAX;


    void init(int n) {
        size = 1;
        while (size < n) size *= 2;
        tree.assign(2 * size - 1, 0);
    }

    void propagate(int x, int lx, int rx) {
        // cout << x << ' ' << lx << ' ' << rx << endl;
        if (tree[x] == NO_OPERATION) return;
        if (rx == lx + 1) return;
        tree[2 * x + 1] = tree[x];
        tree[2 * x + 2] = tree[x];
        tree[x] = NO_OPERATION;
        return;
    }

    void modify(int l, int r, ll v, int x, int lx, int rx) {
            propagate(x, lx, rx);
            if (l >= rx || r <= lx) {
                return;
            }
            if (l <= lx && rx <= r) {
                tree[x] = v;
                return;
            }
            int m = (lx + rx) /2;
            modify(l, r, v, 2 * x + 1, lx, m);
            modify(l, r, v, 2 * x + 2, m, rx);
    }
    
    void modify(int l, int r, int v) {
        modify(l, r, v, 0, 0, size);
    }


    int min2(int l, int r, int x, int lx, int rx) {
        if (l >= rx || lx >= r) {
            return INT_MAX;
        }
        
        if (lx >= l && rx <= r) {
            return tree[x];
        }
        
        int m = (lx + rx) / 2;
        
        int s1 = min2(l, r, 2 * x + 1, lx, m);
        int s2 = min2(l, r, 2 * x + 2, m, rx);
        return min(s1, s2);
    }

    int min2(int l, int r) {
        return min2(l, r, 0, 0, size);
    }

};

void solve() {
    int n, m;
    cin >> n >> m;

    segtree st;
    st.init(n + 1);

    for (int i = 0; i < m; ++i) {
        int f;
        cin >> f;
        if (f == 1) {
            int l, r, v;
            cin >> l >> r >> v;
            st.modify(l, r, v);
            debug(st.tree)
        } else {
            int l, r;
            cin >> l >> r;
            cout << st.min2(l, r) << '\n';
        }
    }
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    int tests = 1;
    // cin >> tests;
    while (tests--) {
        solve();
    }
    return 0;
}