输出格式 The least lexicographic string he can make. Every line (except perhaps the last one) contains the initials of 80 cows (‘A’..’Z’) in the new line.
大致：如果超过80个字就每80个字换一行
输出格式
The least lexicographic string he can make. Every line (except perhaps the last one) contains the initials of 80 cows (‘A’..’Z’) in the new line.
大致：如果超过80个字就每80个字换一行