C++ :: Reading Input File Into Value

I am trying to read from my input file Transactions.data which is set up as follows

V 250190
A 250190 2008 4 8788.00 0.00 000
and so on and so forth.

I am trying to read my V then go to switch (decision) to choose my case and preform further functions. My problem is that i cannot get past the first line so if it was

V 213400
V 123456

My code is supposed to check that the ID (213400) is valid then go on to the next line but it wont do that and prints out the first ID 6 times. My code is as follows:

char descision;
ifstream input;
input.open("Transaction.data");
if (input.fail()) {cout << "File could not be opened." << endl;}
input >> decision;

[Code] ....