28 lines
533 B
C++
28 lines
533 B
C++
#include <ctype.h>
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#include <stdio.h>
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int main(void)
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{
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int n, d, i;
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char sym[64];
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scanf("%d%*c", &n);
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while (n--)
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{
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gets(sym);
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if (sym[0] != '_' && !isalpha(sym[0]))
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{
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puts("no");
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continue;
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}
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for (d = i = 1 ; sym[i] ; i++)
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{
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if (!isalnum(sym[i]) && sym[i] != '_')
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{
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d = 0;
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break;
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}
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}
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puts(d ? "yes" : "no");
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}
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return 0;
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}
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