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How do I write a number and Letter in the same line?

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values = {'Enter a value that is equal to or greater than 0 but equal to or less than 100:','Enter a 2nd value that is equal to or greater than 0 but equal to or less than 100:'};
values = inputdlg(values)
values = str2double(values)
n = mean(values)
if n >= 91
grade='A'
elseif n >= 81
grade='B'
elseif n >= 71
grade='C'
elseif n >= 61
grade='D'
else
grade='F'
end
k = n + grade
disp(k)
I need to write n and grade on the same line, but when this runs, instead of displaying the value of n, it displays a seemingly random symbol or number with the grade letter attached.
example: If I enter 88 & 67 it makes k = 'MC', the values 100 & 20 make k = '<F'.
Please help.

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