[Python] : splice keeps cutting off the third+ digit. Why? How do I fix this?

So I have an assignment that I am working on in python, where I can only splice using the : splice method (i.e group= strg [:index]). For some reason splice refuses to see anything past 2 digits when its numbers. Words are fine but digits are being clipped.

here is my code:

import sys

# set up for for loop
length = len(sys.argv)


for i in range(1, length):
strg = sys.argv
#finds name
index = strg.find(':')
name = strg[:index]
strg = strg[index+1:]

index = strg.find(',')
total = 0
count = 0
while (index != -1):
group = strg[:index]
try:
num = int(group)

except:
break
else:
print(num)
total = total+num
count = count+1
strg = strg[index+1:]

print(count)
avg = total/count
print(name+", average:", avg)


input: Neda:90,80,70,90,50 John:80,100,30 Mary:20,100,90,80

my output:

90
80
70
90
50
5
Neda, average: 76.0
80
10
2
John, average: 45.0
20
10
2
Mary, average: 15.0


intended output:

90
80
70
90
50
5
Neda, average: 76.0
80
100
30
3
John, average: 70.0
20
100
90
80
4
Mary, average: 72.5

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