#include<
stdio.h>
void main()
{
char ch;
scanf("%c",&ch); //ä»é®ç读å
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ch=(ch>='A'&&ch<='Z')?(ch+32):ch; //
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//å¯æ¿æ¢ä¸ºä¸é¢ççä»·è¯å¥ï¼
if(ch>='A'&&ch<='Z') //å¦æè¾å
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ch = ch+32; //å+32ï¼è½¬æ¢ä¸ºå°åå符ï¼
//æ¯å¦ Aå®é
å°±æ¯65 A+32=97 å°±æ¯a
//è¿é说çå°±æ¯asciiç å¼
else ch = ch; //å¦æä¸æ¯å¤§åçï¼chå°±ä¸å
printf("%c\n",ch); //ç¶åè¾åºè¿ä¸ªå符
}