Python3 代码

n = int(input())
s = input()

for i in range (12):
    m = input().split()
    if i == n:
        r = 0
        for j in range (12):
            r += eval(m[j])
        if s == 'S':
            print (f'{r:.1f}')
        else:
            print (f'{r/12.0:.1f}')
        break;