#include<bits/stdc++.h>
#define ll long long

using namespace std;

template<typename T>
inline void in (T &x) {char c;int f=1;do {c=getchar ();if (c=='-') f=-1;} while (c>'9' || c<'0');for (x=0;c>='0' && c<='9';c=getchar ()) x=(x<<1)+(x<<3)+(c^48);x*=f;}

template<typename T>
inline void out (T x,char c) {if (x==0) {putchar ('0'),putchar (c); return ;}if (x<0)putchar ('-'),x=-x;int sta[20],k=0;while (x) sta[++k]=x%10,x/=10;while (k) putchar (sta[k--]+'0');putchar (c);}

const int N=1e3+5;

struct node{
	int chi,mat,id;
}a[N];

int n;

bool cmp(node x,node y){
	if(x.chi==y.chi){
		if(x.mat==y.mat){
			return x.id<y.id;
		}
		return x.mat<y.mat;
	}
	return x.chi<y.chi;
}
int main(){
//	freopen ("std.in","r",stdin);
//	freopen (".out","w",stdout);
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	in(n);
	for(int i=1;i<=n;++i){
		in(a[i].chi),in(a[i].mat);
		a[i].id=i;
	}
	sort(a+1,a+n+1,cmp);
	for(int i=1;i<=n;++i){
		out(a[i].id,' ');
	}	
	return 0;
}