#include "stdio.h"
#include "assert.h"
#include "stdlib.h"

#include <iostream>
#include <bitset>

using namespace std;

#define MPOUFOS (14*1024*1024)

class dianysma{
    public:

    int x;
    int y;
    int arx_id;
    dianysma();
    dianysma(int,int);
    dianysma(const dianysma &);
    dianysma &operator=(const dianysma &);
    dianysma operator+(dianysma);
    dianysma operator-(dianysma);
    int operator^(dianysma);
};
dianysma::dianysma(){

}
dianysma::dianysma(int a, int b){
    x=a;
    y=b;
}
dianysma::dianysma(const dianysma &allo){
    x=allo.x;
    y=allo.y;
    arx_id=allo.arx_id;
}
dianysma &dianysma::operator=(const dianysma &allo){
  x=allo.x;
  y=allo.y;
  arx_id=allo.arx_id;
  return *this;
}
dianysma dianysma::operator+(dianysma allo){
    return dianysma(x+allo.x,y+allo.y);
}
dianysma dianysma::operator-(dianysma allo){
    return dianysma(x-allo.x,y-allo.y);
}
int dianysma::operator^(dianysma allo){
    return (x*allo.y)-(y*allo.x);
}

int N;

FILE *fin,*fout;
int buff_index=0;
char buff[MPOUFOS];

dianysma arx_shmeia[80005];
int stoiba[40005];
int tel_shmeia[80005];

int panw[40001];
int panw_id[40001];
int katw[40001];
int katw_id[40001];
bitset<40001>eida;

int comp2(const void *x,const void *y){
    int ax=*((int *)x);
    int bx=*((int *)y);
    return ax-bx;
}

inline void get_block(){
    fread(buff,1,MPOUFOS,fin);
    buff_index=0;
}

inline char get_char(){

    char ch=buff[buff_index];

    //printf("char %c,ind %d\n",ch,buff_index);
    buff_index++;
    /*
    if(buff_index==MPOUFOS){
        get_block();
    }
    */
    return ch;
}

inline int get_int(){
    int i=0;
    char ch=get_char();
    while(ch<'0'){
        ch=get_char();
    }
    while(ch>='0'){
        i*=10;
        i+=(ch-'0');
        ch=get_char();
    }
    return i;
}

inline int ABxAC(dianysma A,dianysma B, dianysma C){
    return (B-A)^(C-A);
}

int main(){

    int i,j,k;

    //fin=fopen("pulsars.in","r");
    fin=fopen("pulsars.big.txt","rb");
    assert(fin);
    get_block();

    //fscanf(fin,"%d",&N);
    N=get_int();
    //printf("%d\n",N);
    for(i=0;i<N;i++){

        j=get_int();
        k=get_int();
        if(eida[j]){
            if(k>panw[j]){
                panw[j]=k;
                panw_id[j]=i;
            }
            if(k<katw[j]){
                katw[j]=k;
                katw_id[j]=i;
            }
        }
        else{
            katw[j]=panw[j]=k;
            katw_id[j]=panw_id[j]=i;
        }

        eida[j]=true;

    }
    /*
    for(i=0;i<N;i++){
        printf("%d: %d %d\n",i,arx_shmeia[i].x,arx_shmeia[i].y);
    }
    printf("\n");
    */
    fclose(fin);
    //printf("party.\n");

    int real_n=0;
    for(i=0;i<=40001;i++){
        if(!eida[i])continue;
        if(katw[i]==panw[i]){
            arx_shmeia[real_n].x=i;
            arx_shmeia[real_n].y=panw[i];
            arx_shmeia[real_n].arx_id=panw_id[i];
            real_n++;
        }
        else{
            arx_shmeia[real_n].x=i;
            arx_shmeia[real_n].y=katw[i];
            arx_shmeia[real_n].arx_id=katw_id[i];
            real_n++;
            arx_shmeia[real_n].x=i;
            arx_shmeia[real_n].y=panw[i];
            arx_shmeia[real_n].arx_id=panw_id[i];
            real_n++;
        }
    }

    N=real_n;
    /*
    for(i=0;i<N;i++){
        printf("%d: %d %d %d\n",i,arx_shmeia[i].x,arx_shmeia[i].y,arx_shmeia[i].arx_id);
    }
    */

    int top;
    int ola_shmeia=0;

    //panw
    stoiba[0]=0;
    stoiba[1]=1;
    top=1;
    for(i=2;i<N;i++){

        //printf("%d %d\n",i,top);

        int e3wtiko=ABxAC(
            arx_shmeia[stoiba[top-1]],
            arx_shmeia[stoiba[top]],
            arx_shmeia[i]
        );

        if(e3wtiko<0){
            //printf("<0. %d\n",i);
            top++;
            stoiba[top]=i;
        }
        else if(e3wtiko==0){
            //printf("0. %d\n",i);
            stoiba[top]=i;
        }
        else{
            //printf("waa. %d\n",i);
            top--;
            while(
                top>0
                &&
                ABxAC(
                    arx_shmeia[stoiba[top-1]],
                    arx_shmeia[stoiba[top]],
                    arx_shmeia[i]
                )
                >=0
            ){
                //printf("\t%d\n",top);
                top--;
            }
            top++;
            stoiba[top]=i;
        }

    }
    //printf("\n");
    for(i=0;i<=top;i++){
        //printf("%d %d %d\n",i,stoiba[i],arx_shmeia[stoiba[i]].arx_id+1);
        tel_shmeia[ola_shmeia]=arx_shmeia[stoiba[i]].arx_id+1;
        ola_shmeia++;
    }
    //katw
    stoiba[0]=1;
    stoiba[1]=0;
    top=1;
    for(i=2;i<N;i++){

        //printf("%d %d\n",i,top);

        int e3wtiko=ABxAC(
            arx_shmeia[stoiba[top-1]],
            arx_shmeia[stoiba[top]],
            arx_shmeia[i]
        );

        if(e3wtiko>0){
            //printf(">0. %d\n",i);
            top++;
            stoiba[top]=i;
        }
        else if(e3wtiko==0){
            //printf("0. %d\n",i);
            stoiba[top]=i;
        }
        else{
            //printf("waa. %d\n",i);
            top--;
            while(
                top>0
                &&
                ABxAC(
                    arx_shmeia[stoiba[top-1]],
                    arx_shmeia[stoiba[top]],
                    arx_shmeia[i]
                )
                <=0
            ){
                //printf("\t%d\n",top);
                top--;
            }
            top++;
            stoiba[top]=i;
        }

    }
    //printf("\n");
    for(i=0;i<=top;i++){
        //printf("%d %d %d\n",i,stoiba[i],arx_shmeia[stoiba[i]].arx_id+1);
        tel_shmeia[ola_shmeia]=arx_shmeia[stoiba[i]].arx_id+1;
        ola_shmeia++;
    }

    qsort(tel_shmeia,ola_shmeia,sizeof(int),comp2);

    //printf("\n");
    i=0;
    top=0;
    while(i<ola_shmeia){
        //printf("%d\n",tel_shmeia[i]);
        j=tel_shmeia[i];
        stoiba[top]=j;
        top++;
        while(tel_shmeia[i]==j)i++;
    }
    //printf("\n");
    fout=fopen("pulsars.out","w");
    //printf("%d\n",top);
    fprintf(fout,"%d\n",top);
    for(i=0;i<top;i++){
        //printf("%d\n",stoiba[i]);
        fprintf(fout,"%d\n",stoiba[i]);
    }
    fclose(fout);

    return 0;
}