Count number of characters in a column.

Count number of characters in a column.

I just need you suggestions. Am from Biology Back ground. I just need to find out number of characters in a column i.e, if i have a file with text in this manner ACGT GCTA GCTA i need to count characters in 1st, 2nd, 3rd columns seperatly and also print flase if i found any other characters other than A,G,C,T...Please help me out.

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