HackerRank- Python Nested Lists

Given the names and grades for each student in a Physics class of N students, store them in a nested list and print the name(s) of any student(s) having the second lowest grade.

marksheet=[]
scorelist=[]
if __name__ == '__main__':
        for _ in range(int(input())):
                name = input()
                score = float(input())
                marksheet+=[[name,score]]
                scorelist+=[score]
        b=sorted(list(set(scorelist)))[1] 

        for a,c in sorted(marksheet):
             if c==b:
                    print(a)