在课堂上，老师经常说：“Scan the QR code to sign in now.” 现在，Gew 想问你这句话中有多少个小写英文字母。
输入格式
输入仅包含一行，即句子 “Scan the QR code to sign in now.”。
输出格式
输出一个整数，表示问题的答案。
样例
样例输入 1
Scan the QR code to sign in now.
样例输出 1
-1
说明
样例的输出是不正确的。你需要自己算出答案，并得到正确的判决。
QOJ.ac
QOJ
Time Limit: 1.0 s
Memory Limit: 512 MB
Total points: 100
Hackable ✓
#10757. 最简单的问题
Statistics
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