codechef - chef and string

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fast()(ios_base::sync_with_stdio(0),cin.tie(NULL));
int main()
{
    fast()
    int t;
    cin>>t;
    while(t--)
    {
        string s;
        int cnt=0,i=0;
        cin>>s;
        int sz=s.size();
        while(i<sz)
        {
            if(s[i]=='x'&& s[i+1]=='y')
            {
                cnt++;
                i++;
            }
            else if(s[i]=='y'&& s[i+1]=='x')
            {
                cnt++;
                i++;
            }
            i++;
        }
        cout<<cnt<<endl;
    }
}