20 lines
362 B
C
20 lines
362 B
C
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#include <stdio.h>
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int main(){
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while(1){
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char ch;
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int num = 'a' - 'A';
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scanf("%c", &ch);
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if(ch == EOF || ch == -1){
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return 0;
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}
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if(ch <= 'A' && ch >= 'Z'){
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ch += num;
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}
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else if(ch >= 'a' && ch <= 'z'){
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ch -= num;
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}
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printf("%c", ch);
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}
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}
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