#include <iostream>
using namespace std;
string szyfr (string s){
string t="";
int i; for (i=0; i<s.size()-1; i+=2)
t=t+s [i+1]+s[i];
if (s.size()%2!=0)
t=t+s[s.size()-1];
return t;
}
int main() {
cout <<szyfr("kotwica")<<endl;
cout <<szyfr("szyfrowanie jest trudne")<<endl;
return 0;
}
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