Please Perl help.....

Please I'm new to perl give me solution for this....:confused:

I have file contain following
Charith 5 matara
Saman 2 kanya
Viraj 8 jafna
Anura 4 kandy
.
.
I need to replace above second colomn numbers as follow (incrimental sequence as 0,1,2,3,4....) out put should like follow
Charith 0 matara
Saman 1 kanya
Viraj 2 jafna
Anura 3 kandy

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