s = input() #y=0x-1
for _ in range(int(input())):
    x,y = map(int, input().split())
    n = s.index("x")
    m = int(s[2:n])
    c = int(s[n+1::])
    if y == (m*x+c):
        print("YES")
    else:
        print("NO")