You may find it’s easy to calculate the expression such as: a = 3 b = 4 c = 5 a + b + c = ? Isn’t it?
The first line contains an integer stands for the number of test cases. Each test case start with an integer n stands for n expressions will follow for this case. Then n – 1 expressions in the format: [variable name][space][=][space][integer] will follow. You may suppose the variable name will only contain lowercase letters and the length will not exceed 20, and the integer will between -65536 and 65536. The last line will contain the expression you need to work out. In the format: [variable name| integer][space][+|-][space][variable name| integer] …= ? You may suppose the variable name must have been defined in the n – 1 expression and the integer is also between -65536 and 65536. You can get more information from the sample.
For each case, output the result of the last expression.
aa = 1
bb = -1
aa = 2
aa + bb + 11 = ?
1 + 1 = ?
1 + -1 = ?