Program HOC24;
var a: array[1..32000] of string;
d,i,n: integer;
begin
write('Nhap N: '); readln(n);
for i:=1 to n do
begin
write('a[',i,']='); readln(a[i]);
end;
d:=0;
for i:=1 to n do
if length(a[i]) = 3 then d:=d+1;
write('Co ',d,' so co 3 chu so trong day');
readln
end.