作业3：计算给定字符串中字母和数字的个数给定字符串s1 = Hello world! 123q7、计算该字符串中字母个数结果保存到a7中；q8、计算该字符串中数字个数结果保存到a8中；5a7 = # 填入你的结果如 a7 = 5a8 = # 填入你的结果如 a8 = 6给定字符串s2 = qw15eki!9co2i1n4q9、计算该字符串中字母个数结果保存到a9中；q10、计算该字符串中数字个

s1 = 'Hello world! 123' s2 = 'qw15eki!9co2i1n4|'

a7 = sum(1 for char in s1 if char.isalpha()) a8 = sum(1 for char in s1 if char.isdigit())

a9 = sum(1 for char in s2 if char.isalpha()) a10 = sum(1 for char in s2 if char.isdigit())

a7, a8, a9, a10