28 lines
449 B
C
28 lines
449 B
C
#include <stdio.h>
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int
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main (void)
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{
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freopen ("6", "r", stdin);
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int out = 0;
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int c = 0;
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while (c != EOF) {
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int y[26] = {0};
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while (c != EOF) {
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c = getchar ();
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if (c == '\n')
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{
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c = getchar ();
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if (c == '\n')
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break;
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}
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if (c != EOF) /* else intentionally not used */
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y[c - 'a'] = 1;
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}
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for (int i = 0; i < sizeof y / sizeof y[0]; i++)
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out += y[i];
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}
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printf ("%d\n", out);
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return 0;
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}
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