/C01025 - HÌNH VUÔNG NHỎ NHẤT

              #define _CRT_SECURE_NO_WARNINGS
        #include <stdio.h>
        #include <math.h>
        
        int findMin(int* a, int* b, int* c, int* d) {
          int minV = *a;
          minV = (minV > *b) ? *b : minV;
          minV = (minV > *c) ? *c : minV;
          minV = (minV > *d) ? *d : minV;
          return minV;
        }
        
        int findMax(int* a, int* b, int* c, int* d) {
          int maxV = *a;
          maxV = (maxV < *b) ? *b : maxV;
          maxV = (maxV < *c) ? *c : maxV;
          maxV = (maxV < *d) ? *d : maxV;
          return maxV;
        }
        
        int main() {
        
          int x1, x2, y1, y2;
          int c1, c2, d1, d2;
        
          scanf("%d %d %d %d", &x1, &x2, &y1, &y2);
          scanf("%d %d %d %d", &c1, &c2, &d1, &d2);
        
          int minX = findMin(&x1, &y1, &c1, &d1);
          int maxX = findMax(&x1, &y1, &c1, &d1);
          int minY = findMin(&x2, &y2, &c2, &d2);
          int maxY = findMax(&x2, &y2, &c2, &d2);
        
          int res = (abs(maxX - minX) > abs(maxY - minY)) ? abs(maxX - minX) : abs(maxY - minY);
        
          printf("%d", res * res);
          return 0;
        }