/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
br.readLine();
int cnt = 0;
int ans = 0;
for(int i=0;i<str.length();i++) {
if(str.charAt(i)=='x') {
cnt++;
} else {
cnt = 0;
}
if(cnt>=3) {
ans++;
}
}
}
}
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