def padro(filename, year1, year2):
    s={};
    with open(filename, 'r') as file:
        for person in file:
            dades=person.split()
            year=int(dades[5])
            age=int(dades[3])
            if year>=year1 and year<=year2:
                if age in s:
                    s[age]=s[age]+1
                else:
                    s[age]=1
    s=sorted(s.items())
    return s