def nbOccu(lettre,texte):
    nbLettres=0
    for i in texte:
        if lettre==i:
            nbLettres+=1
    print(nbLettres)

def major(texte):
    lettre=''
    major=0
    for i in texte:
        compte=0
        for j in texte:
            if j==i:
                compte+=1
        if compte>major:
            major=compte
            lettre=i
        if compte==major:
            lettre1=i
    if lettre==lettre1:
        return(lettre)
    else:
        return(lettre,lettre1)