#include <bits/stdc++.h>
 
using namespace std;
 
#define file(NAME) if (fopen(NAME".inp", "r"))  freopen(NAME".inp", "r", stdin), freopen(NAME".out", "w", stdout)
#define FOR(i, a, b) for (int i = (int) a; i <= (int) b; ++i)
#define FOD(i, a, b) for (int i = (int) a; i >= (int) b; --i)
 
#define all(s) (s).begin(), (s).end()
#define pb push_back
#define ll long long
#define fi first
#define se second
#define pii pair<int, int>
 
const int maxn = 105 + 5;
const int N = 505;
const int MOD = 1e9 + 7;
 
int n;
pii a[maxn];
int dp[maxn], trace[maxn];
 
 
 
signed main() {
    cin.tie(0) -> sync_with_stdio(0);
    file("x");
 
    cin >> n;
 
    FOR(i, 1, n) {
        cin >> a[i].fi >> a[i].se;
    }
 
    sort(a + 1, a + n + 1);
 
 
    dp[1] = 1;
    FOR(i, 2, n) FOD(j, i - 1, 1) {
        if (a[i].se >= a[j].se && dp[i] < dp[j] + 1) {
            dp[i] = dp[j] + 1;
            trace[i] = j;
        }
    }
 
 
    int id = 0, ans = 0;
    FOR(i, 1, n) {
        if (ans < dp[i]) {
            ans = dp[i];
            id = i;
        }
    } 
 
    cout << ans << '\n';
 
    vector<int> res;
    while (id) res.pb(id), id = trace[id];
 
    reverse(all(res));
 
    for (int x : res) cout << x << ' ';
    return 0;
}

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