19 lines
248 B
C
19 lines
248 B
C
#include <stdio.h>
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#include <ctype.h>
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int main() {
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int c = 0;
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while(1) {
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c = getchar();
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}
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if (c == islower(c)) {
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c = toupper(c);
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}
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else if (c == isupper(c)) {
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c = tolower(c);
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}
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return 0;
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}
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