#include <stdio.h>
#include <math.h>
 
typedef struct {
    int x, y;
} Point;
 
int main() {
    int err, n;
    scanf("%d", &err);
    scanf("%d", &n);
 
    Point target, hide_sites[n];
    scanf("%d %d", &target.x, &target.y);
 
    for (int i = 0; i < n; ++i) {
        scanf("%d %d", &hide_sites[i].x, &hide_sites[i].y);
    }
 
    int closest_torso_index1 = -1, closest_torso_index2 = -1;
    int min_torso_error = 99999;
 
    for (int i = 0; i < n; ++i) {
        int distance_square = (hide_sites[i].x - target.x) * (hide_sites[i].x - target.x) +
                             (hide_sites[i].y - target.y) * (hide_sites[i].y - target.y);
        int error = sqrt(distance_square);
 
        if (error <= min_torso_error) {
            min_torso_error = error;
            closest_torso_index2 = closest_torso_index1;
            closest_torso_index1 = i;
        }
    }
 
    int error = 0;
    int target_width = 0;
 
    if (min_torso_error <= 2000) {
        target_width = 35;
    }
 
    if (target_width > 0) {
        error = (target_width * 100) / min_torso_error;
    }
 
    if (target_width == 35) {
        printf("%d %d\n", closest_torso_index1, closest_torso_index2);
    } else {
        printf("abort\n");
    }
 
    return 0;
}
 

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