#include <iostream>
using namespace std;
int ile(string s, char z)
{
int ilosc=0;
for(int i=0; i<=s.size()-1 ; i++)
if (s[i]==z)
ilosc++;
return ilosc;
}
int pary(string s)
{
int ilosc=0;
for(int i=0; i<s.size()-1 ; i++)
if (s[i]==s[i+1])
ilosc++;
return ilosc;
}
int main() {
cout << pary("CAATTA") << endl;
return 0;
}
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