题解 | #计算某字符出现次数#

def cal(sentence,word):
    sentence = sentence.lower() # 统一小写（空格和数字在str.lower(）作用下不变）
    word = word.lower() #统一小写
    words = [  a for a in sentence if a == word ] # list comprehension 构造sentence中与word一致的列
    frequency = len(words) # 列长度即为sentence中包含word的长度
	return frequency

in_1 = input() # 变量1
in_2 = input() # 变量2
out_ = cal(in_1,in_2) # 所求
print(out_) # print出所求