PAT 1036

题意：

给一组学生成绩，求最高分的女生和最低分的男生，并求该分差

注意点
1.若最高分或最低分有多个人，则输出absent和NA！

n = input()
maleg = 101
femaleg = -1
for i in range(0,n):
    sinfo = raw_input()
    name,sex,ID,grade =  sinfo.split()
    if sex == 'M':
        if int(grade) < maleg:
            minnum=1
            malename,maleID,maleg=name,ID,int(grade)
        elif int(grade) == maleg:
            minnum=minnum+1
    
    if sex == 'F':
        if int(grade) > femaleg:
            maxnum=1
            femalename,femaleID,femaleg=name,ID,int(grade)
        elif int(grade) == femaleg:
            maxnum=maxnum+1

NAf = 0
if femaleg == -1 or maxnum != 1:
    print "Absent"
    NAf =1
    
else :
    print femalename,femaleID


if maleg == 101 or minnum !=1 :
    print "Absent"
    NAf =1
else :
    print malename,maleID


if NAf == 1:
    print "NA"
else :
    print femaleg - maleg