sWAP cASE

You are given a string S. The task is to Swap Cases. In other words, convert all lowercase letters to uppercase letters and vice versa.

For Example:

Www.HackerRank.com → wWW.hACKERrANK.COM
Pythonist 2 → pYTHONIST 2

Input Format

A single line containing a string S.

Output Format

Print the modified string S.

Solution:

def swap_case(s):

    a = s.swapcase()

    return a

b = input()

print(swap_case(b))

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Smallest Discount item

Choose item with the smallest discount offered among n items given

Input Format 

First line will contain the value of  n

Followed by n lines contains item name, cost and discount percent separated by spaces.

Output Format

The name of the item which offers least discount 

a = int(input())

c = 999999

for i in range (a):

    b = input().split()

    d = int(b[1])*(int(b[2])/100)

    if c>d:

        c = d

        s = b[0]

print(s)

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Balanced Brackets

Given n strings of brackets, determine whether each sequence of brackets is balanced. If a string is balanced, print YES on a new line; otherwise, print NO on a new line.

Input Format

The first line contains a single integer n denoting the number of strings.
Each line  of the  subsequent lines consists of a single string s denoting a sequence of brackets.

Output Format

For each string, print whether or not the string of brackets is balanced on a new line. If the brackets are balanced, print YES; otherwise, print NO.

t = { ')': '(', ']':'[', '}':'{' }
for i in range(int(input())):
    s = []
    for x in input():
        if s and t.get(x) == s[-1]:
            s.pop()
        else:
            s.append(x)
    print("NO" if s else "YES")

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