#include<stdio.h>
#include<math.h>
#define max(a,b) \
   ({ __typeof__ (a) _a = (a); \
       __typeof__ (b) _b = (b); \
     _a > _b ? _a : _b; })
#define min(a,b) \
   ({ __typeof__ (a) _a = (a); \
       __typeof__ (b) _b = (b); \
     _a < _b ? _a : _b; })
int main(){
    int n;
    scanf("%d",&n);
    long l_border, r_border;
    long x, y;
    scanf("%ld %ld",&l_border, &r_border);
    while(2 == scanf("%ld %ld", &x, &y)){
        //printf("x:%ld, y:%ld, l_border:%ld, r_border:%ld, x>r_border:%d, y < l_border:%d\n",x,y,l_border,r_border,x>r_border,y<l_border);
        if (x > r_border+1 || y < l_border-1){
            printf("%ld %ld\n",l_border,r_border);
            l_border = x;
            r_border = y;
            continue;
        }
        r_border = max(r_border,y);
        l_border = min(l_border,x);
    }
    printf("%ld %ld\n",l_border,r_border);
    return 0;
}