uses crt;
const razd:set of char=[' ','.',','];
var count,i,max,n:integer;
st,buf:string;
slova:array[1..100]of string;
begin
clrscr;
write('-> ');
readln(st);
count:=1;
repeat
if (st[1] in razd) or (length(st)=1) then while st[1] in razd do delete(st,1,1)
else
begin
while (not(st[1] in razd)) and (length(st)>1) do
begin
buf:=buf+st[1];
delete(st,1,1);
end;
slova[count]:=buf;
buf:='';
inc(count);
end;
until (length(st)=1) and (length(buf)=0);
max:=0;
for i:=1 to count-1 do
begin
if length(slova[i])>max then
begin
max:=length(slova[i]);
n:=i;
end;
end;
writeln(slova[n]);
readln;
end.