#include int main() { int a,b,c,d; scanf("%d%d%d%d",&a,&b,&c,&d); if(c==a+b-1) { printf("Alice"); return 0; } if((a+b-c)%2==0) { int c2 = 1; if(d==1) c2 = 0; if(b-a >=c && c%2 == c2) printf("Alice"); else if(a-b >=c && c2 == 0) printf("Alice"); else printf("Bob"); } else { int val = a+b-c; if(b<= val/2) { if(d==-1) { printf("Bob"); return 0; } } if(a<= val/2) { int c1,c2; c1 = (b-(val-a)); if(d==-1) c2 = 1; else c2 = 0; if(c1!=c2) { printf("Bob"); return 0; } } printf("Alice"); } }