19 lines
250 B
C
19 lines
250 B
C
#include <stdio.h>
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int main(){
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int c = 0;
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char a;
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while(1){
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c = getchar();
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if(c == EOF)
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break;
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if (c >= 'a' && c <= 'z')
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c = c - 'a' + 'A';
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else if(c >= 'A' && c <= 'Z')
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c = c - 'A' + 'a';
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a = c;
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putchar(a);
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}
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return 0;
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}
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