#include <bits/stdc++.h>
#include "snakelib.h"
using namespace std;
char a1, a2;
int main(){
int k = get_speed();
ask_snake(4040, 8080, &a1, &a2);
int sl, el, sr, er;
if(a1 == 'f'){
tie(sl, el, sr, er) = make_tuple(0, 4040, 0, 4040);
}
else if(a1 == 's'){
tie(sl, el) = make_tuple(0, 4040);
if(a2 == 's') tie(sr, er) = make_tuple(8080, 12121);
else tie(sr, er) = make_tuple(4040, 8080);
}
else{
if(a2 == 'f') tie(sl, el, sr, er) = make_tuple(4040, 8080, 4040, 8080);
else if(a2 == 's') tie(sl, el, sr, er) = make_tuple(4040, 8080, 8080, 12121);
else tie(sl, el, sr, er) = make_tuple(8080, 12121, 8080, 12121);
}
for(int i=0; (er - sr > k || el - sl > k); i++){
el += k;
er += k;
int ml = (sl + el) / 2;
int mr = (sr + er) / 2;
ask_snake(ml, mr, &a1, &a2);
if(a1 == 'b') sl = ml + 1;
else el = ml;
if(a2 == 'f') er = mr;
else sr = mr + 1;
}
int est1 = (er - el);
int est2 = (sr - sl);
tell_length(max(1, (est1 + est2) / 2));
}
