#include <iostream>
using namespace std;
string szyfr(string s) {
string t = "";
for (int 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() {
szyfr("kotwica");
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKc3RyaW5nIHN6eWZyKHN0cmluZyBzKSB7CglzdHJpbmcgdCA9ICIiOwoJZm9yIChpbnQgaSA9IDA7IGkgPCBzLnNpemUoKSAtIDE7IGkgKz0gMikKCXQgPSB0ICsgc1tpICsgMV0gKyBzW2ldOwoJaWYgKHMuc2l6ZSgpICUgMiAhPTApCgl0ID0gdCArIHNbcy5zaXplKCkgLSAxXTsKCXJldHVybiB0Owp9CgoKCmludCBtYWluKCkgewogc3p5ZnIoImtvdHdpY2EiKTsKCXJldHVybiAwOwp9