Problem: A TV show called "Guess a number!" is gathering popularity. The whole Berland, the old and the young, are watching the show.

The rules are simple. The host thinks of an integer y and the participants guess it by asking questions to the host. There are four types of acceptable questions:

  * Is it true that y is strictly larger than number x? 
  * Is it true that y is strictly smaller than number x? 
  * Is it true that y is larger than or equal to number x? 
  * Is it true that y is smaller than or equal to number x? 



On each question the host answers truthfully, "yes" or "no".

Given the sequence of questions and answers, find any integer value of y that meets the criteria of all answers. If there isn't such value, print "Impossible".

Input

The first line of the input contains a single integer n (1 ≤ n ≤ 10000) — the number of questions (and answers). Next n lines each contain one question and one answer to it. The format of each line is like that: "sign x answer", where the sign is:

  * ">" (for the first type queries), 
  * "<" (for the second type queries), 
  * ">=" (for the third type queries), 
  * "<=" (for the fourth type queries). 



All values of x are integer and meet the inequation  - 109 ≤ x ≤ 109. The answer is an English letter "Y" (for "yes") or "N" (for "no").

Consequtive elements in lines are separated by a single space.

Output

Print any of such integers y, that the answers to all the queries are correct. The printed number y must meet the inequation  - 2·109 ≤ y ≤ 2·109. If there are many answers, print any of them. If such value doesn't exist, print word "Impossible" (without the quotes).

Examples

Input

4
&gt;= 1 Y
&lt; 3 N
&lt;= -3 N
&gt; 55 N


Output

17


Input

2
&gt; 100 Y
&lt; -100 Y


Output

Impossible

Solution (in PYTHON3):

Solution:
'''
> y is larger than x
< y is smaller than x
>= y is larger or equal to x
<= y is smaller or equal to x

------------> implementation <------------------
4
>= 1 Y
< 3 N
<= -3 N
> 55 N
=----------=
4
>= 1 Y          (1 is larger ot equal to y )
< 3 N           not (3 is smaller than y )
<= -3 N         not (-3 is smaller or equal to y )
> 55 N          not (55 is larger than y )

=--------------------------=
so number is any number between 4 --> 54
number can randomly choose with those conditions.

'''
from random import randint
inf = 2*10**9
def main():
    n = int(input())
    lt, rt = -inf, inf
    opposite = {'<':'>=', '<=' : '>', '>' : '<=', '>=' : '<'}
    for i in range(n):
        a, b, c = input().split()
        b =int(b)
        if c == 'N':
            a = opposite[a]
        if a == '<':
            rt = min(rt,b-1)
        elif a == '<=':
            rt = min(rt,b)
        elif a == '>':
            lt = max(lt, b+1)
        elif a == '>=':
            lt = max(lt, b)
    if lt > rt:
        print('Impossible')
    else:
        print(randint(lt,rt))


if __name__ == '__main__':
    main()