s = input() target = input() dic_s = {} for i in s: if i not in dic_s: dic_s[i] = 1 else: dic_s[i] += 1 sum = 0 if target in dic_s: sum += dic_s[target] if 'A'<= target <= 'Z': target = chr(ord(target)+32) if target in dic_s: sum += dic_s[target] elif 'a'<= target <= 'z': target = chr(ord(target)-32) if target in dic_s: sum += dic_s[target] print(sum) 这是需要判断大小写的方式