def countSort(arr):

aux = []

for i in range(0,20):
    for j in range(0,1):
        aux.append(arr[i][j])
aux = list(map(int, aux))


for i in range(0,20):
    for j in range(0,1):
        arr[i][j] = aux[i]

aux = arr.copy()


aux.sort()


for i in range(0,20):
    for j in range(0,10):
        if(aux[i][1] == arr[j][1]):
            aux[i][1] = '-'


for i in range(0,20):
    print(aux[i], end=' ')




arr = [['0','ab'],['6','cd'],['0','ef'],['6','gh'],['4','ij'],['0','ab'],['6','cd'],['0','ef'],['6','gh'],['0','ij'],['4','that'],['3','be'],['0','to'],['1','be'],['5','question'],['1','or'],['2','not'],['4','is'],['2','to'],['4','the']]

countSort(arr)