题解 | #计算某字符出现次数#

string = input().lower()
val = input().lower()

summ = 0
for v in string:
    if v == val:
        summ += 1
print(summ)

1. str.lower()字符串小写；str.upper()大写
2. 换行输入，多次input()接收不同行输入