arr=['0']*100010//实现栈的进出
def main():
a=list(input())
a.append('0')//防止 如果i=len(a)-1时i+=1 arr[tt]=a[i]越界
tt,i,sum=0,0,0
while i<=len(a)-2:
while tt and arr[tt]==a[i] and i<=len(a)-2:
tt-=1
i+=1
sum+=1
tt+=1
arr[tt]=a[i]
i+=1
if sum%2:
print("Yes")
else:
print("No")
main()