Run Time Error in Python

http://www.codechef.com/NOV12/problems/TOURMAP

my code:


    #!/usr/bin/python
d1={}
d2={}
d3={}
test=input()
while test:
        n=input()
        num=0
        for i in range(n-1):
                s=raw_input().split()
                d1[s[0]]=s[1]
                d3[s[0]]=s[2]
                num=num+int(s[2][:-1])
                if d2.has_key(s[0]):
                        d2[s[0]]=d2[s[0]]+1
                else:
                        d2[s[0]]=5

                if d2.has_key(s[1]):
                        d2[s[1]]=d2[s[1]]+1
                else:
                        d2[s[1]]=1
    
        for city,value in d2.iteritems():
                if value == 5:
                        s=city
                        break
        for i in range(n-1):
                print city,d1[city],d3[city]
                city=d1[city]
        print str(num)+"$"
        test=test-1

I don’t knw y code is not coming in proper way in question but it’s understandable I suppose.

//