clear
clc

grades = input('what were your grades? [...] ')

for index = 1:length(grades)
    grade = grades(index);
    if grade >= 89
        letter = 'A';
    elseif grade >= 79
        letter = 'B';
    elseif grade >= 69
        letter = 'C';
    elseif grade >= 59
        letter = 'D';
    else
        letter = 'F';
    end
    fprintf('Class %d grade %0.1f was %s\n', index, grade, letter)
end