ACM 11541 - Decoding

#include <stdio.h>
#include <ctype.h>
char str[400], ch;
int count;
int main()
{
    int caseNum, i, j, k, isPut;
    scanf("%d", &caseNum);
    for (i = 1; i <= caseNum; i ++)
    {
        printf("Case %d: ", i);
        scanf("%s", str);
        for (j = 0; str[j]; j ++)
        {
            if (isalpha(str[j])) ch = str[j], isPut = 1, count = 0;
            else if (isPut && isdigit(str[j]))
                 count = count * 10 + str[j] - '0';
            if (isPut && str[j + 1] == '\0' || !isdigit(str[j + 1]) && count > 0)
            {
                 while (count --)
                     printf("%c", ch);
                 isPut = 0;
            }
        }
        printf("\n");
    }
    return 0;
}

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