#include int main() { int h1, w1, h2, w2, h3, w3; scanf("%d%d\n%d%d\n%d%d",&h1,&w1,&h2,&w2,&h3,&w3); h1 = h1 * 100 -w1; h2 = h2 * 100 -w2; h3 = h3 * 100 -w3; for (int i = 3;i--;) { if (h1 > h2 && h1 > h3) { puts("A"); h1 = -1; } if (h2 > h1 && h2 > h3) { puts("B"); h2 = -1; } if (h3 > h1 && h3 > h2) { puts("C"); h3 = -1; } } }