Solution with explanation: First sort the nested lists in aplhabetical order. Make a separate set for marks ,remove duplicate values and sort it. The second element is the second lowest marks so now print the names that have second lowest marks.

if name == 'main': stud=[] for _ in range(int(input())): name = input() score = float(input()) stud.append([name,score])

    # sort in alphabetical order of name
_stud=sorted(stud,key= lambda x: x[0])


marks=[] #stores marks
for i in range(len(_stud)):
    marks.append(_stud[i][1])

    #removes duplicate values and arrange in descending order
marks=list(sorted(set(marks))) 

answer=marks[1]

#print students with second lowest marks
for i in range(len(_stud)):
    if(_stud[i][1]==answer):
        print(_stud[i][0])